Question

.Chitra was watching her favourite TV serial suddenly the picture started shaking on TV screen. She asked her brother to check the dish antenna. Her brother found no problem in dish. Chitra noticed the same problem in TV picture again after some time. At the same time she heard the sound of low flying air craft passing over their house. She asked her brother again. He explained the cause of shaking picture on TV screen when air craft passes over head. Name the values used by Chitras brother ?

Why the picture on the TV screen was shaking when air craft was passing over head?

Answer 1

The outer surface of a low flying aircraft can reflect the incoming radio waves back upwards. This can cause interference between the direct waves and the reflected waves which causes a slight shaking in the TV image.