MHT CET Physics question

When a low flying aircraft passes over head, we sometimes notice a slight shaking of the picture on our TV screen. This is due to

(A)diffraction of the signal received from the antenna
(B)interference of the direct signal received by the antenna with the weak signal reflected by the passing aircraftCorrect
(C)change in magnetic flux occurring due to the passage of aircraft
(D)vibration created by the passage of aircraft

Answer: (B)

Solution

The antenna receives the direct signal plus a weak signal reflected from the moving aircraft; the changing path difference makes the two interfere

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Question ID VK-082214