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Lakhmir Singh & Manjit Kaur - Physics

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Q. 514.7( 13 Votes )

Give reason for the following :

In most of the cases, we cannot see the vibrations of a sound producing object with our eyes.

Class 9th Lakhmir Singh & Manjit Kaur - Physics 5. Sound

Answer :

The lowest frequency that anyone can hear is 20 Hz. Hence time period is = 1/20 = 0.05 Sec. Due to Persistence of vision in our eyes we can not see the vibration of less than 0.1 sec. Therefore we are not able to see the vibrations of any sound producing objects.

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