Question

An object makes 20 vibrations in 20 seconds. Calculate the following for the vibration of the object
a) Frequency b) Time period
Will the sound produced by the object be audible to the human ear? Give reasons.

Answer 1

Answer:

1. 0.05 hz
2. 1 second

please follow

Answer 2

Frequency is the rate at which the waves pass a fixed point. Or the no of vibrations per second.

In the given question 20 vibrations happen in 20 seconds so number of vibration occuring in one second is

$20/20 =1$

So Frequency is 1 hz

Si unit of frequency is hertz

Time period is the time taken to complete one vibration

So again

$20/20 =1 sec \: \:$

Also

$T=1/f$

so

$1/1=1$

Time period = 1 second

The audible range of human is 20hz -20000hz.As the frequency is only 1 hz humans cannot hear this sound.

This sound comes under infrasonic range .

The sounds waves with frequency less than 20hz are called infrasonic sound and the sound waves with frequency more than 20000 hz are called ultrasonic sound.

Further links-

https://brainly.in/question/13823405

https://www.google.com/url?sa=t&source=web&rct=j&url=https://brainly.in/question/6230898&ved=2ahUKEwjp1rys_ND5AhXG8TgGHVBXCBwQjjh6BAgOEAE&usg=AOvVaw1GKrxnF7dbBGDMqKagd3eq

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