A sound absorber attenuates the sound level by 20 dB. The intensity decreases by a factor of

  • Option 1)

    100

  • Option 2)

    1000

  • Option 3)

    10000

  • Option 4)

    10

 

Answers (1)

As we learnt in

Effect of temperature on speed of sound -

\because \frac{P}{\rho }= \frac{RT}{M}

\therefore V= \sqrt{\frac{\gamma RT}{M}}

 

- wherein

V \alpha \sqrt{T}

T is in Kelvin

So velocity increses with increase in temperature.

 

 

 

 

L_{1}= 10\log \left ( \frac{I_{1}}{I_{0}} \right ),L_{2}= 10\log \left ( \frac{I_{2}}{I_{0}} \right )

\therefore L_{1}-L_{2}= 10\log \left ( \frac{I_{1}}{I_{0}} \right )-10\log \left ( \frac{I_{2}}{I_{0}} \right )

or\: \Delta L= 10\log \left ( \frac{I_{1}}{I_{2}} \right )

or \: 20\; dB\: = 10\log \left ( \frac{I_{1}}{I_{2}} \right )

or\: 10^{2}= \frac{I_{1}}{I_{2}} or\: \: I_{2}= \frac{I_{1}}{100}

Correct option is 1.


Option 1)

100

This is the correct option.

Option 2)

1000

This is an incorrect option.

Option 3)

10000

This is an incorrect option.

Option 4)

10

This is an incorrect option.

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