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Sound — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceSound1 Mark
MCQ
The waves which propagate in metals are:
  • A
    Longitudinal
  • B
    Transverse
  • C
    Both (a) and (b)
  • D
    None of these
✓

Answer

  1. Both (a) and (b)

Explanation:

In solids, there are two kinds of acoustic waves -- longitudinal [the medium is vibrating in the direction of the acoustic wave] and transverse [the medium is vibrating at right angles to the direction of propagation]. The speed of sound is greater for longitudinal waves. The trend in the speed of sound is: the harder the material and the lower density - the faster is the speed of sound.

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