Question

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 source at the same speed. The observer B stays stationary. The surrounding space is vacuum everywhere.

(a) v_A > v_B > v_c.

(b) v_A < v_B < v_c

(c) v_A = v_B = v_c.

(d) v_B =1/2 (v_A+v_c).

Answer 1

(c) v_A = v_B = v_c.

(d) v_B =1/2 (v_A+v_c).