Doppler Effect

posted by .

How fast must we be approaching a distant galaxy emitting yellow light (590nm) for it to appear green (520nm)?

I believe it uses doppler effect, but how?

  • Doppler Effect -

    for non-relativistic speeds, we can use the approximation.

    c/520 = (1+v/c) * c/590
    520(1+v/c) = 590
    1+v/c = 59/52
    v/c = 7/52
    v = 7/52 c

    Is that relativistic? Generally, less than 0.1c is considered non-relativistic, so we may be a bit off, but if that matters, use the exact formula, which you can find with a quick web search.

    Not being sure just how the Doppler effect is calculated, I just did some online searches. You could also have done this.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. DrBob222

    The Doppler effect is a change in the ______of a sound. pitch
  2. Physics

    Question about doppler effect: How do you solve when it gives you percentage value?
  3. physics

    how does the doppler effect relate to destructive interference?
  4. Physics

    I need a complete list all the doppler effect equations for a beginner physics class. Here is a sample questions so you know the level Question: Two trains on separate tracks move toward one another. Train #1 has a speed of 130 km/hr …
  5. physics

    Explain the Doppler Effect?
  6. math

    A traffic light follows the pattern green, yellow, red for 55, 5, and 20 seconds, respectively. What is the probability that the driver approaching this light will find it green or yellow?
  7. science help pls pls

    A star is observed from two positions of Earth in its orbit, in summer and winter. Which of these is the best method to calculate the approximate distance of the star from Earth?
  8. Physics - Doppler Effect

    How fast is a car moving and in what direction if the frequency of the horn drops from 900 Hz to 875 Hz, as heard by a stationary listener?
  9. Doppler Effect

    Doppler Effect a flying bat emits squeaks at a frequency of 85 khz if a stationary observer picks up the frequency of the squeaks as 80 khz is the bat moving towards or away from the listener ?
  10. Doppler Effect

    Doppler Effect A car is travelling towards you at 16 m.s -1 sounding its hooter with a frequency of 320hz the. The velocity of sound is 330m.s-1 . what is the frequency of the sound that you will hear ?

More Similar Questions