Q2 of 16 Page 79

A normal human being can listen to sounds with frequency from _______to ________ vibrations per sec.

A normal human being can listen to sounds with frequency from 20 To 20,000 vibrations per sec.


Explanation: Every living being can listen to a certain rang of sound only. For example, Dogs can hear the sound from 64 to 44,000 vibrations per second. Similarly, human ears can only perceive the sound from 20 to 20,000 vibrations per sec.


More from this chapter

All 16 →
1

Fill in the blanks with suitable words.

a) The to and fro motion of a body from its mean position is called …………………..


b) Number of vibrations per second is called …………………..


c) The intensity of sound can be measured in ………………….


d) Sound cannot travel in ………………….


e) Vibrating bodies produce ……………………


f) The maximum displacement of a body from its mean position is called …………..

 3

How will you differentiate the amplitude and frequency of different sounds? Give two suitable examples from your daily life.

 4

Write any three musical instruments that you know and explain how they produce sound.

 5

The sounds of crickets (insects) make us close our ears. Why?