A rocket is receding away from earth with velocity 0.2 c.
The rocket emits signal of frequency 4 × 10⁷ Hz. The
apparent frequency observed by the observer on earth will
be
(a) 4 × 10⁶ Hz (b) 3.2 × 10⁷ Hz
(c) 3 × 106⁶ Hz (d) 5 × 10⁷ Hz
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