The apparent wavelength of the light from a star, moving away from the earth, is 0.01% more than its real wave length. The speed of the star with respect to the earth is ……………… .

The apparent wavelength of the light from a star, moving away from the

1.	The apparent wavelength of the light from a star, moving away from the earth, is 0.01% more than its real wave length. The speed of the star with respect to the earth is ……………… .
Answer» 10 km/s 15 km/s 30 km/s 60 km/s SOLUTION :`(v_(r))/(C) = (Delta LAMBDA)/(lambda)`or `v_(r) = (0.01)/(100) xx 3 xx 10^(8) = 3 xx 10^(4)` m/s = 30 km/s