Question

beats are here due to the interference of two sound waves the intensity of sound change from maximum to minimum in 100 mili second . find the difference in the frequency of the two sound wave

Answer 1

On the day of 17 May 2157, Tommy found a real book. He showed it to Margie. Margie was eleven years old. She had never seen a real book before. She had once heard from her grandfather about the printed books. It was a very old book. Its pages have turned yellow and crinkly. They turned its pages and read them. Tommy found it just a waste. They had no printed books. Their books flashed on the television screen. Tommy who was of thirteen had read more books on the television screen than Margie.

 Tommy told Margie that it was a book about