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  • Stuck here, help me understand: A sound absorber attenuates the sound level by 20 dB. The intensity decreases by a factor of

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)

best_answer

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.

Posted by

perimeter

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