Three observers A, B and C measure the speed of light coming from a source to be `v_A,v_B` and `v_C`. The observer A moves towards the source and C moves away from the soure at the same speed. The observer B stays stationary. The surrounding space is vacuum everywhere.

Options

A. `v_ lt v_(B) lt v_(C )`
B. () `v_(A) gt v_ gt v_(C )`
C. `v_(C ) = (v_(B) + v_(A))/(2)`
D. `v_(A) = v_(B) = v_(C )`

Answer

C, D

Explanation

Speed of light in vaccume is an absolute constant.
It does not depend upon velocity of observer. As
`v_(A) = v_(B) = v_(C )`, therefore, `v_(C ) = (v_(A) + v_(B))/(2)`