Optics Question 258
Question: Due to Doppler’s effect, the shift in wavelength observed is 0.1 Å for a star producing wavelength 6000 Å. Velocity of recession of the star will be
Options:
A) 2.5 km/s
B) 10 km/s
C) 5 km/s
D) 20 km/s
Show Answer
Answer:
Correct Answer: C
Solution:
$ \frac{\Delta \lambda }{\lambda }=\frac{v}{c}\ \therefore v=\frac{\Delta \lambda }{\lambda }c=\frac{0.1}{6000}\times 3\times 10^{5}km/s=5\ km/s $
