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 ……
A. 10 km/s
B. 15 km/s
C. 30 km/s
D. 60 km/s
Answer:C
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 ……
A. 10 km/s B. 15 km/s C. 30 km/s D. 60 km/s