Question: Urgent Astronomy help?!?
I have my Astronomy gcse today and Im really stuck on this question. anyone know who to work it out using the doppler shift equation?
"A distant galaxy has a recession speed of 0.01c. It produces a red line of wavelength 6.4x10-7m. Calculate the wavelength detected on Earth"
i think i can help. first what is a recession speed and wavelength?
Fo = Fv / (V+-Vo) So V = c andVo = 0.01c
So Fo = 6.4 E-7 c / 1.01c = 6.4 E-7/1.01 = 6.337 E-7 m
you need multiple other pieces of information: 1. what is the distance from the galaxy to earth? 2. How long does it take the wavelength to decrease in intensity?
Give me that and I'll be able to help you