Q19 of 31 Page 388

Explain why (or how):

in a sound wave, a displacement node is a pressure antinode and vice versa,

A node (N) is a point where the amplitude of vibration is the minimum and pressure is the maximum. An antinode (A) is a point where the amplitude of vibration is the maximum and pressure is the minimum. Therefore, a displacement node is also a pressure antinode and vice versa.


More from this chapter

All 31 →
17

A pipe 20 cm long is closed at one end. Which harmonic mode of the pipe is resonantly excited by a 430 Hz source? Will the same source be in resonance with the pipe if both ends are open? (speed of sound in air is 340 m s–1).

 18

Two sitar strings A and B playing the note ‘Ga’ are slightly out of tune and produce beats of frequency 6 Hz. The tension in the string A is slightly reduced and the beat frequency is found to reduce to 3 Hz. If the original frequency of A is 324 Hz, what is the frequency of B?

 19

Explain why (or how):

bats can ascertain distances, directions, nature, and sizes of the obstacles without any “eyes”,

 19

Explain why (or how):

a violin note and sitar note may have the same frequency, yet we can distinguish between the two notes,