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  • Please,please help me A point source emits sound equally in all directions, in a non-absorbing medium.Two points P and Q are at a distance od 2 m and 3 m from the source. The ratio of the intensities of the waves at P and Q is

A point source emits sound equally in all directions, in a non-absorbing medium. Two points P and Q are at  a distance od 2 m and 3 m from the source. The ratio of the intensities of the waves at P and Q is

  • Option 1)

    9:4

  • Option 2)

    2:3

  • Option 3)

    3:2

  • Option 4)

    4:9

 

Answers (1)

best_answer

Intensity \alpha \frac{1}{distance^{2}} \Rightarrow \frac{I_{1}}{I_{2}} =\left ( \frac{d_{2}}{d_{1}}\right )^{2}

\frac{I_{1}}{I_{2}} =\left ( \frac{3}{2}\right )^{2} = 914

 

Intensity of periodic sound waves -

I= \frac{\Delta P{_{m}}^{2}}{2\rho v}
 

- wherein

\Delta P_{m}= Maxmium pressure change

\rho = density

v= velocity of sound

 

 

 


Option 1)

9:4

This is correct.

Option 2)

2:3

This is incorrect.

Option 3)

3:2

This is incorrect.

Option 4)

4:9

This is incorrect.

Posted by

Avinash

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