Physics Past Questions and Answers

A wave of frequency 10Hz forms a stationary wave pattern in a medium where the velocity is 20cms<sup style='font-size: smaller;'>-1</sup>. The distance between adjacent nodes is

Which of the following is true of the loudness of sound? It

A man clapping his hands at regular intervals observes that the echo of a clap coincides with the next clap. If the reflecting cliff is 160m away and the speed of sound is 320ms<sup style='font-size: smaller;'>-1</sup>, what is the frequency of the clapping?

The vibration of an air column produces the sound in the

Which of the following is NOT a part of a d.c. electric motor?