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The intensity of sound from a ratio at a distance of 2 metres from its speaker is 1 \times 10^{-2} \mu w/m^{2}. The intensity at a distance of 10 metres would be

  • Option 1)

    0.2 \times 10^{-2} \mu w/m^{2}

  • Option 2)

    1 \times 10^{-2} \mu w/m^{2}

  • Option 3)

    4 \times 10^{-4} \mu w/m^{2}

  • Option 4)

    5 \times 10^{-2} \mu w/m^{2}

 

Answers (1)

best_answer

I \alpha \frac{1}{r^{2}} \Rightarrow \frac{I_{1}}{I_{2}} = \frac{r_{1}^{2}}{r_{2}^{2}} \Rightarrow \frac{I_{2}}{1 X 10^{-2}} = \frac{2^{2}}{10^{2}} = \frac{4}{100} \Rightarrow I_{2} = \frac{4 X 10^{-2}}{100} = 4 X 10^{-4} , \mu w/m^{2}

 

Intensity of the wave -

Energy transmitted per unit area per second in the form of the wave in the direction of the wave by source.

- wherein

This energy is carried forward by the medium particles which transfer energy to the next particle.

 

 

 


Option 1)

0.2 \times 10^{-2} \mu w/m^{2}

It is incorrect.

Option 2)

1 \times 10^{-2} \mu w/m^{2}

It is incorrect.

Option 3)

4 \times 10^{-4} \mu w/m^{2}

It is correct.

Option 4)

5 \times 10^{-2} \mu w/m^{2}

It is incorrect.

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