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Sound — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceSound1 Mark
MCQ
A pulse is allowed to get reflected from a wall. Then:
  • A
    $\angle\text{r}=\angle\text{i}$
  • B
    Compression becomes rarefaction.
  • C
    Only (a).
  • D
    Both (a) and (b).
✓

Answer

  1. Compression becomes rarefaction.

Explanation:

The frequency of a wave is not altered by crossing a boundary. The reflected pulse becomes inverted when a wave in a less dense rope is heading towards a boundary with a more dense rope. The amplitude of the incident pulse is always greater than the amplitude of the reflected pulse.

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