一道物理题,求波长A galaxy is receding from us at a speed v = 0.96c.Light _英语解答

一道物理题,求波长
A galaxy is receding from us at a speed v = 0.96c.
Light emitted by the galaxy at a wavelength of 450 nm would
appear to us to have a wavelength λearth of:
答案是λearth = 3150 nm
怎么算阿?

人气：108 ℃　时间：2020-04-28 17:44:51

解答

用光波的多普勒效应公式即可.λ0=λearth*根号下（1-b/1+b）=λearth/7=450nm
对了这是sat么?