Physics Past Questions and Answers

Which of the following is not a mechanical wave?

Which of the following remains unchanged as light travels from one medium to the other? i. speed. ii. wavelength. iii. frequency.

Which of the following statements about wave is not correct? i. A wavefront is a line which contains all particles whose vibration are in phase. ii. The direction of propagation of a wave is the link drawn parallel to the wavefront. iii. A wavefront is a circle which is common to particles that are in the same state of disturbance

What type of motion does the skin of a talking drum perform when its being struck with the drum stick?

The sound from a bell in an enclosed jar gradually faints away while the jar is being evacuated. Which of the following explains this observation?