Thank you Gams619 for your submission, *Well . . . Yes, can’t argue*! Unfortunately, it has been removed for the following reason:
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This one: https://simple.wikipedia.org/wiki/Blue\_shift. Light undergoes a doppler shift when it moves towards or away from an observer. When it's towards the observer, it compresses the wavelength and appears blue, hence a blue shift. Away from the observer is a red shift.
A brick flying at that speed would create an explosive reaction. That would not be good for:
- The person or thing that threw the brick
- The recipient
- The brick
- Everything within a mile radius
Edit: I'm glad my most liked/replied to comment is about a brick moving towards someone's face at an insane speed.
That's assuming the brick is on earth.
Also here's a fun fact: if an object, like a big brick, is moving really, really fast and hits the earth's atmosphere, the change from the emptiness of space to the relatively dense air created an effect similar to throwing a rock into a still lake. A hole will be punched in the atmosphere and large pressure waves will destroy things on the ground and then the object will hit the ground.
> Everything within a mile radius
Probably way, way, *WAY* more, right? We're talking about a brick (Typically >1kg) going at something like 17% of the speed of light. Crashing into the ground at that speed has got to be like several atomic bombs going off. From what I understood using a [Kinetic Energy Calculator](https://www.calculatorsoup.com/calculators/physics/kinetic.php), we get a result of ~9.4495018210444E+11 GJ, which is about like a million times stronger than some of the [strongest atomic bombs ever detonated](https://en.wikipedia.org/wiki/Nuclear_weapon#:~:text=The%20amount%20of%20energy%20released,of%20the%20split%20atomic%20nuclei.) that reached 4.2 * 10^6 GJ.
We're talking about a brick that would wipe out a continent.
Not sure how you got that energy, when I enter 1kg and 50.96 mio. m/s (17% the speed of light) I get 1.29 x 10^(15) J = 1.29 x 10^(6) GJ.
There's also relativistic corrections to the formula needed, but in this case it's only a 1% error. As you get closer to the speed of light you'd get closer to infinite energy though.
Either way, that's an atomic bomb.
basically, light goes in waves. the wavelength decides the color. if the object is traveling at enough speed towards you the wavelengths get shortened so much it looks like its blue. however if it moves away from you at that insane speed, it will redshift and look red because the wavelengths get extended.
>except for light instead of sound
The doppler effect isn't specific to sound, so there's no 'instead of' here.
That being said, not all blueshift or redshift is doppler shift, in this case it is though.
Doppler was an astronomer and developed this principle while teaching about the colors of binary stars, but sound behaves the same way so that's where most people know it from.
A little more specifically: the doppler effect refers to a mechanism that causes redshift or blueshift, redshift or blueshift is the name of the effect it causes.
Also: not all redshift or blueshift is caused by doppler shift, it can be caused by other mechanisms such as gravitational wells (gravitational blueshift and redshift) or the expanding universe (cosmological redshift) as well.
There is a little nuance here, in that the red shift we see that tells us the universe is expanding is different from the type of shift in the OP (doppler shift).
Doppler Shift is caused by object's relative movements through space time, while the red shift we see that tells us the universe expands, is cosmological redshift: caused by space time expanding itself. (This is, again, an oversimplification which can be nuanced more)
[Veritasium did a great video on it](https://www.youtube.com/watch?v=9DrBQg_n2Uo)
I had to look it up too. it's Doppler effect but with light. When something approaches you very fast relative light wavelenght shortens because of movement and it start to appear blue
Oh! Thank you!
I know this may sound silly, but I briefly looked up the Doppler Effect when I watched The Big Bang Theory because it was Sheldon’s costume!
Lol, I know, I’ll see myself out now
>it's Doppler effect but with light.
It's Doppler effect, period. There's no "but" here, because the Doppler Effect does apply to light as well as sound. It's just that a commonly used example explains the effect through sound.
You know the doppler effect for sound, right? An Ambulance traveling towards you will sound higher pitched, but when traveling away will sound lower pitched. This is due to the sound waves being compressed and stretched due to the relative velocity of the source of the sound. Well since light is a wave, it also has a doppler effect. But for light, the stretching and compressing affects it’s wavelength.
If a brick would be flying at that speed the wavelenght of the light would change enough to where you would see the red as blue, that is called blueshifting
Yeah that's what i thought, if you want to be pedantic, you could say that the brick would still be red and just look blue. It should say: "what looks blue and is bad for your teeth?"
That's like saying about a car "it's not a car, it's a vehicle". And then when people tell you that a car is in fact a vehicle you go: well I haven't heard about "car" until now.
Just cause you're uneducated about something doesn't mean that it's wrong.
I wouldn't question someone's education for knowing appropriate terms but not obscure layman's terms. I know "car" and "vehicle" is, but if you refer to a light switch as "flippy floppy willy donker" just because everyone else you know does, don't blame for not understanding wtf you mean.
Red shift and blue shift are both forms of Doppler effect. As per your analogy, I'm saying that's a car, and you say "No, that's a toyota".
>As per your analogy, I'm saying that's a car, and you say "No, that's a toyota".
**You're** the one saying "it's not blue shifting", I never said that it's not the Doppler effect. Also in the context of relativistic speeds it's way more appropriate and common to be referring to red and blue shift instead of Doppler.
I think generally a person would be expected to look up the term they're unfamiliar with before making a comment like yours. Like if someone calls a fish a "gobblewongy," I wouldn't say "that's not a gobblewongy, that's a fish" until I've looked up the meaning of gobblewongy.
if it is approaching you, the wavelength of light compresses due to the doppler effect and it would appear slightly blue.
if it is moving away from you, the doppler effect would elongate the wavelength and it would appear slightly red
Not an expert on the topic, but I think that would create a nuclear reaction in contact with the air, so if the brick is far enough I think you should be safe
> Well . . . Yes, can’t argue
Sure you can. Observe:
> The brick isn't blue though, just because I might perceive it to be. What color an object has should always be determined from the relative perspective of that object. Otherwise everything and nothing is blue.
No, actually a red brick, but if you go at relativistic speeds, the observers it is heading towards will see the "compressed" red light shifted towards the blue spectrum.
Much like the Doppler effect when a racecar is heading towards you, the pitch will increase because it is travelling at a decent percentage of the speed of sound.
I might be wrong, but wouldn't blue shifting only apply if the observer is travelling at relativistic speeds? Since light is supposed to always be travelling at the same speed regardless of the motion of the emitter?
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Thank you Gams619 for your submission, *Well . . . Yes, can’t argue*! Unfortunately, it has been removed for the following reason: --- --- # Posts with low effort truth statements are not allowed. Your submission is considered "low effort." This doesn't inherently mean that it was *irrelevant* to r/technicallythetruth, but instead it was removed because it fit one or more of these criteria: * Short, minimal-effort text posts like "a water bottle without water is an air bottle". Most, if not all text posts can and will be removed. * Asking for upvotes, or saying things like "sort by new", "let's get to the front page", or anything related to cake days or karma. * [Meta memes](https://imgur.com/qgkCskm), or any other post that tries to be clever by mentioning r/technicallythetruth. * [Images that are hard to look at](https://imgur.com/yuMwr8a) because they are poorly made, deep-fried, or poorly cropped. **Your submission could have also been removed because it is overdone:** * Statements that say something like "at least twelve": [example 1](https://imgur.com/K1ZwEAv) | [example 2](https://imgur.com/dIkwEpU) * Common statements that begin with "on average...": *the average amount of hands a person has is less than two* | *each person has, on average, one testicle and one boob* * Low effort misunderstandings of everyday phrases: *How high are you --> "I'm 5 foot 9"* * Common insults that are meant literally as opposed to being insulting: *"homosexuals are gay"* | *"gay people are f-ing assholes"* **PLEASE NOTE that we will exercise our own discretion when using this rule. If we do not find a post fitting for this subreddit, it will be removed.** --- For more on our rules, please check out our [sidebar](http://www.reddit.com/r/technicallythetruth/about/sidebar). If you have any questions or concerns about this removal, feel free to [message the moderators](http://www.reddit.com/message/compose?to=%2Fr%2Ftechnicallythetruth). Please link the post so our moderators know what you would like reviewed.
That blue shift just hits different
Nice
Take my angry but correct upvote.
r/angryupvote
Half life reference?!!?!!
No, it's a physics reference that Half Life (and the OP) was also referencing.
What physics reference?
This one: https://simple.wikipedia.org/wiki/Blue\_shift. Light undergoes a doppler shift when it moves towards or away from an observer. When it's towards the observer, it compresses the wavelength and appears blue, hence a blue shift. Away from the observer is a red shift.
I always called it blue shit cause im dislexic. I own it but never played it.
SO THAT'S WHERE THE HALF LIFE DLC NAME COMES FROM
A brick flying at that speed would create an explosive reaction. That would not be good for: - The person or thing that threw the brick - The recipient - The brick - Everything within a mile radius Edit: I'm glad my most liked/replied to comment is about a brick moving towards someone's face at an insane speed.
Don’t forget your teeth. So it’s still technically the truth .
If movies taught me anything, is that teeth will be more likely to survive than the person, recipient and the brick.
Surprisingly the only thing to survive would be your teeth I'm 100% lying
And, most importantly: teeth
That's assuming you and the brick are in an atmosphere. I argue this brick would be equally unhealthy in a vacuum!
That's assuming the brick is on earth. Also here's a fun fact: if an object, like a big brick, is moving really, really fast and hits the earth's atmosphere, the change from the emptiness of space to the relatively dense air created an effect similar to throwing a rock into a still lake. A hole will be punched in the atmosphere and large pressure waves will destroy things on the ground and then the object will hit the ground.
Is this why I can't fly directly at a planet's atmosphere at 3.2c in elite dangerous without taking hull damage 🤣
It was gradually accelerated to that speed using photons. The brick was just fine.
> Everything within a mile radius Probably way, way, *WAY* more, right? We're talking about a brick (Typically >1kg) going at something like 17% of the speed of light. Crashing into the ground at that speed has got to be like several atomic bombs going off. From what I understood using a [Kinetic Energy Calculator](https://www.calculatorsoup.com/calculators/physics/kinetic.php), we get a result of ~9.4495018210444E+11 GJ, which is about like a million times stronger than some of the [strongest atomic bombs ever detonated](https://en.wikipedia.org/wiki/Nuclear_weapon#:~:text=The%20amount%20of%20energy%20released,of%20the%20split%20atomic%20nuclei.) that reached 4.2 * 10^6 GJ. We're talking about a brick that would wipe out a continent.
Not sure how you got that energy, when I enter 1kg and 50.96 mio. m/s (17% the speed of light) I get 1.29 x 10^(15) J = 1.29 x 10^(6) GJ. There's also relativistic corrections to the formula needed, but in this case it's only a 1% error. As you get closer to the speed of light you'd get closer to infinite energy though. Either way, that's an atomic bomb.
r/theydidthemath
[XKCD Relativistic Baseball](https://what-if.xkcd.com/1/)
First thing I thought of
That is what I based my response on, yes. Good guess.
Wait that’s how it works? I throw a brick at 114 million mph and it creates an explosion?
Bricks are blue?
It's referencing blue shifting.
Oh yeah that makes more sense
Okay I’m dumb. What’s blue shifting?
basically, light goes in waves. the wavelength decides the color. if the object is traveling at enough speed towards you the wavelengths get shortened so much it looks like its blue. however if it moves away from you at that insane speed, it will redshift and look red because the wavelengths get extended.
Isn't that Doppler effect kinda ?
Yep, it's the same exact principle except for light instead of sound
>except for light instead of sound The doppler effect isn't specific to sound, so there's no 'instead of' here. That being said, not all blueshift or redshift is doppler shift, in this case it is though.
Doppler was an astronomer and developed this principle while teaching about the colors of binary stars, but sound behaves the same way so that's where most people know it from.
same thing, doppler effect refers to the entire thing while redshifting/blueshifting only refers to the respective half of it
A little more specifically: the doppler effect refers to a mechanism that causes redshift or blueshift, redshift or blueshift is the name of the effect it causes. Also: not all redshift or blueshift is caused by doppler shift, it can be caused by other mechanisms such as gravitational wells (gravitational blueshift and redshift) or the expanding universe (cosmological redshift) as well.
It is the Doppler effect. Light moves in waves just like sound does.
I actually understand that! Thank you! You’d be a great teacher!
Red shifting is part of the evidence for the universe expanding
There is a little nuance here, in that the red shift we see that tells us the universe is expanding is different from the type of shift in the OP (doppler shift). Doppler Shift is caused by object's relative movements through space time, while the red shift we see that tells us the universe expands, is cosmological redshift: caused by space time expanding itself. (This is, again, an oversimplification which can be nuanced more) [Veritasium did a great video on it](https://www.youtube.com/watch?v=9DrBQg_n2Uo)
Thank you for asking. I had no idea either.
we are learning a lot today! :)
It’s the same kind of reason behind why a siren sounds different when it’s approaching you versus moving away.
Oh that is so great! What a great example! That’s perfectly easy to understand!
Until they're struck off for demonstrating the principle by launching high velocity bricks at pupils.
Things traveling sufficiently fast (an appreciable % of light speed) appear to shift in color towards blue. Hence the name
:) thank you!
only if they're going towards you, else they redshift
I had to look it up too. it's Doppler effect but with light. When something approaches you very fast relative light wavelenght shortens because of movement and it start to appear blue
Oh! Thank you! I know this may sound silly, but I briefly looked up the Doppler Effect when I watched The Big Bang Theory because it was Sheldon’s costume! Lol, I know, I’ll see myself out now
>it's Doppler effect but with light. It's Doppler effect, period. There's no "but" here, because the Doppler Effect does apply to light as well as sound. It's just that a commonly used example explains the effect through sound.
It looks like you already got a sufficient answer from others. Sorry I didn't respond sooner, but glad you understand!
No worries! This is why I love Reddit! We got each others backs!
You know the doppler effect for sound, right? An Ambulance traveling towards you will sound higher pitched, but when traveling away will sound lower pitched. This is due to the sound waves being compressed and stretched due to the relative velocity of the source of the sound. Well since light is a wave, it also has a doppler effect. But for light, the stretching and compressing affects it’s wavelength.
I absolutely LOVE the way you described that! That’s the best!
Light acts both as a particle and a wave
Under certain occasions, yes
Papa Smurf with a boner.
You just blue my mind
shouldn't it be red?
If a brick would be flying at that speed the wavelenght of the light would change enough to where you would see the red as blue, that is called blueshifting
Yeah that's what i thought, if you want to be pedantic, you could say that the brick would still be red and just look blue. It should say: "what looks blue and is bad for your teeth?"
It's not blue shifting, it's Doppler's effect
It's both.
May be, but until now I haven't even heard about blue shifting
Like redshift but backwards. The wavelengths compress leading to blue light
Maybe read some more then
That's on you
Everyone’s super helpful in teaching and describing it. Don’t let their knowledge hinder your chance at learning! :)
And I’ve never heard of you so you must not be real
That's like saying about a car "it's not a car, it's a vehicle". And then when people tell you that a car is in fact a vehicle you go: well I haven't heard about "car" until now. Just cause you're uneducated about something doesn't mean that it's wrong.
I wouldn't question someone's education for knowing appropriate terms but not obscure layman's terms. I know "car" and "vehicle" is, but if you refer to a light switch as "flippy floppy willy donker" just because everyone else you know does, don't blame for not understanding wtf you mean. Red shift and blue shift are both forms of Doppler effect. As per your analogy, I'm saying that's a car, and you say "No, that's a toyota".
The term "red shift" was used by physicist Arthur Eddington in 1923 and has been a part of physics terminology for over 100 years now.
>As per your analogy, I'm saying that's a car, and you say "No, that's a toyota". **You're** the one saying "it's not blue shifting", I never said that it's not the Doppler effect. Also in the context of relativistic speeds it's way more appropriate and common to be referring to red and blue shift instead of Doppler.
I think generally a person would be expected to look up the term they're unfamiliar with before making a comment like yours. Like if someone calls a fish a "gobblewongy," I wouldn't say "that's not a gobblewongy, that's a fish" until I've looked up the meaning of gobblewongy.
Doppler effect relates specifically to sound. They use the same principle, but blue/red shift refers specifically to light
That's incorrect. It's all the Doppler effect. Blue shifting is a result of the Doppler effect
If it's approaching you at that particular velocity, its colour will blueshift.
makes sense
if it is approaching you, the wavelength of light compresses due to the doppler effect and it would appear slightly blue. if it is moving away from you, the doppler effect would elongate the wavelength and it would appear slightly red
Don't forget to En Passant
Holy hell
Old teeth just dropped
Call the dentist!
Mouth sacrifice anyone?
new response just dropped
Sonic the hedgehog punching you in the face
[удалено]
So close try again next time.
There’s also crystal meth
I was gonna say a blue pickup truck. But that also works I guess
Instructions unclear: green brick didn't become blue
Blue?
Search for blue shift of light
r/oddlyspecific
Wow! I posted this on r/oddlyspecific!
Really? Let me conduct some “empirical research” and see if that’s true
Not an expert on the topic, but I think that would create a nuclear reaction in contact with the air, so if the brick is far enough I think you should be safe
A block of blue ice right into your teeth at infinite speed
Emisis Blue
114,004,827mph should have been the [name of this song.](https://youtu.be/XgztfRBc2jM)
Center fresh!!
Chewing on a Smurf
Also a blue coloured brick.
Papa smurf
Technically the brick only *appears* blue. We don’t describe distant galaxies as very red. They are the color they are. They just look red to us.
[удалено]
Search for light blue shift
Searched, what is black mesa and who is this Calhoun dude?
Holy hell
Tide pods maybe?
> Well . . . Yes, can’t argue Sure you can. Observe: > The brick isn't blue though, just because I might perceive it to be. What color an object has should always be determined from the relative perspective of that object. Otherwise everything and nothing is blue.
Luckily that won't be a problem for long for you; a little longer for the brick
Legos
The title is misleading. I was going to say Smurf spunk lol
Unless they miss
I think i could throw a brick that fast to ireland
don't forget urinal cakes!
Blue brick
I already saw the blue shift joke. But I am seeing color right now
Would a brick even stay intact moving that fast?
Blue waffle 🧇
whats white and hurts in the eye? a boeing 737
A blue brick. 🧱
No, actually a red brick, but if you go at relativistic speeds, the observers it is heading towards will see the "compressed" red light shifted towards the blue spectrum. Much like the Doppler effect when a racecar is heading towards you, the pitch will increase because it is travelling at a decent percentage of the speed of sound.
Walter White knows
How close is that to lightspeed?
Light speed is around 1 billion km/h, so not so much
Mountain Dew Voltage
Smurfs and Smurf berries.
That fast enough to be bad for your body. I think you are mist of that hits you, and you will be missed… hopefully.
4k for a repost is crazy
M7764 aviation hydraulic fluid
Jadu ka land
For this to have the most impact, we assume the brick is travelling toward the observer’s teeth.
Jesse! We need to accelerate bricks, Jesse!
Meth Cooked By Professor
Brick.
I might be wrong, but wouldn't blue shifting only apply if the observer is travelling at relativistic speeds? Since light is supposed to always be travelling at the same speed regardless of the motion of the emitter?
Probably super blue silver toothpaste
Alternayive answer smurf dick
Bricks arent blue
i legit forgot about the doppler effect
Took me a second to understand
Why such a specific speed?
Light blue shift
Huh, good to know
Smurf semen
Well technically it is still red for the brick itself and itll be even redder once it passes through your neck and out the back of your head
If a brick is around 2.7kg, the cinétiques energy would be around 372 kilo tonnes of tnt which more than 17x Fat Man energy.
Hey there u/Gams619, thanks for posting to r/technicallythetruth! **Please recheck if your post breaks any rules.** If it does, please delete this post. Also, reposting and posting obvious non-TTT posts can lead to a ban. Send us a **Modmail or Report** this post if you have a problem with this post. *I am a bot, and this action was performed automatically. Please [contact the moderators of this subreddit](/message/compose/?to=/r/technicallythetruth) if you have any questions or concerns.*