Physics
Sumit, a teenager, enjoys playing his music loudly. However, his grandmother consistently lowers the volume of the music player. Analyze the wave to identify which characteristic of the wave has been altered when the grandmother reduces the volume.
- The length PS becomes more.
- The length SR becomes less.
- The length QR becomes less.
- The length PR becomes less.
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Answer
The length QR becomes less.
Reason — When Sumit’s grandmother lowers the volume, she’s reducing the wave’s amplitude, the maximum displacement from the mean position. In the diagram:
- P and R lie on the mean position (zero-displacement).
- Q marks the crest (maximum positive displacement).
- QR is the vertical distance from the equilibrium to the crest, which equals the amplitude. Reducing volume shrinks that vertical distance, so QR becomes smaller.
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