Q123 / 180 · COMEDK 2016 · Physics

A star is moving away from the earth with speed v. Change in wavelength $d \lambda$ observed on earth is

  • Correct answer
    A
    $\lambda v / c$
  • B
    $\lambda v /(c+v)$
  • C
    $\lambda c /(c+v)$
  • D
    $\lambda c / v$

Solution

The Doppler shift in wavelength of light from star is given by $d \lambda=\frac{\lambda v}{c}$

Hence, the correct answer is option: 'A'.

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