No she isn't. She gets the Sound thing WRONG right off the bat. The person coming closer gets louder but that's not increasing *frequency* -- that's increasing *amplitude* of the wave -- increasing frequency makes the PITCH *HIGHER*, not the sound louder.
How do you know the actual start peak is 600nm ? You observe some star as 606nm wavelength visible light. Why would you belive this is not it's "real" light peak?
You can use spectroscopy. There are many elements with known absorption lines. If we observe an element like iron in a star and see the absorption lines shifted from where we would expect them to be, we note that there has been a shift
The thing that I still don't understand is, how do the shifts happen when the speed of light is constant in a vacuum?
Hi there, redshifts and blueshifts occur due to a change in the frequency of a light wave, not the speed of light itself.
You're so good at explaining
No she isn't. She gets the Sound thing WRONG right off the bat. The person coming closer gets louder but that's not increasing *frequency* -- that's increasing *amplitude* of the wave -- increasing frequency makes the PITCH *HIGHER*, not the sound louder.
I First got into this to understand why the cc explains why the universe is shrinking.
How do you know the actual start peak is 600nm ? You observe some star as 606nm wavelength visible light. Why would you belive this is not it's "real" light peak?
You can use spectroscopy. There are many elements with known absorption lines. If we observe an element like iron in a star and see the absorption lines shifted from where we would expect them to be, we note that there has been a shift
@@astronaughtpov thanks
Nope, if the frequency changing is the pitch changing - not amplitude (loudness) . Sad because the graphics are good. You sound like Physics girl!