Q19 of 31 Page 388

Explain why (or how):

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

Bats emit ultrasonic waves of large frequencies. When these waves are reflected from the obstacles in their path, they give them the idea about the distance, direction, size and nature of the obstacle.


More from this chapter

All 31 →
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):

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

 19

Explain why (or how):

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

 19

Explain why (or how):

solids can support both longitudinal and transverse waves, but only longitudinal waves can propagate in gases, and