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Q. No.A point source is placed at the origin. Its intensity at a distance of \(2 ~\text{cm}\) from the source is \(I,\) then intensity at a distance \(4~\text{cm}\) from the source shall be:
1. \(\frac{I}{2}\)
2. \( \frac{I}{16}\)
3. \( \frac{I}{4}\)
4. \(I\)
1. \(\frac{I}{2}\)
2. \( \frac{I}{16}\)
3. \( \frac{I}{4}\)
4. \(I\)
Subtopic: Energy of Waves |
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A small speaker delivers \(2~\text{W}\) of audio output. At what distance from the speaker will one detect \(120~\text{dB}\) intensity sound? [Given reference intensity of sound as \(10^{-12}\) W/m2]
1. \(20~\text{cm}\)
2. \(10~\text{cm}\)
3. \(40~\text{cm}\)
4. \(30~\text{cm}\)
Subtopic: Energy of Waves |
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Level 3: 35%-60%
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Q. No.
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