Relationship Between Distance and Intensity (HSC SSCE Physics): Quizzes

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Relationship Between Distance and Intensity
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What is the unit used to express sound intensity?

W⋅m−2\text{W} \cdot \text{m}^{-2}

According to the inverse square law, how is intensity related to distance?

Inversely proportional to distance squared

If you double your distance from a sound source, what happens to the intensity?

It becomes one-quarter

If you triple your distance from a sound source, what happens to the intensity?

It becomes one-ninth

What is the intensity value for the threshold of hearing?

10−12 W⋅m−210^{-12} \text{ W} \cdot \text{m}^{-2}

What type of scale is the decibel scale?

Logarithmic

An increase of 10 dB represents what change in sound intensity?

Tenfold increase

For the inverse square law to apply accurately, the sound source must be what?

A point source with no reflections

Which formula converts decibels to W⋅m−2\text{W} \cdot \text{m}^{-2}?

I=10(dB10−12)I = 10^{\left(\frac{\text{dB}}{10} - 12\right)}

Using I1I2=(d2d1)2\frac{I_1}{I_2} = \left(\frac{d_2}{d_1}\right)^2, if d2=4d1d_2 = 4d_1, what is I2I_2 in terms of I1I_1?

I2=I116I_2 = \frac{I_1}{16}

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