28 A boy is walking away from a wall at a speed of 1 0 ms in

Last updated: 6/21/2023

28 A boy is walking away from a wall at a speed of 1 0 ms in a direction at right angles to the wall The boy blows a whistle steadily An observer towards whom the boy is moving hears 4 beats s If the speed of sound is 340 ms the frequency of whistle is a 480 Hz b 680 Hz c 840 Hz d 1000 Hz Observer Box Wall