Chapter 11, Problem 11A.5E

Interpretation Introduction

Interpretation:

Doppler shifted wavelength of red traffic light has to be determined.  Also the speed at which the light appears as green has to be calculated.

Concept Introduction:

Doppler shift is relative change in frequency or wavelength of a wave with respect to the observer’s motion.  The change in wavelength can be measured using following equation.

  $\frac{\Delta \lambda }{{\lambda }_0}=\frac{v}{c}$

Where,

  $\Delta \lambda =$ shift in wave length

  ${\lambda }_0=$ wave length of the stationary source

  $v=$ velocity of the observer

  $c=$ speed of light