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Sound — Science STD 9 — Question

Gujarat BoardEnglish MediumSTD 9ScienceSound1 Mark
MCQ
An object attached to one end of a spring makes $20$ vibrations in $10s.$ Its frequency is:
  • ✓
    $2Hz$
  • B
    $10s$
  • C
    $0.05Hz$
  • D
    $2s$
✓

Answer

Correct option: A.
$2Hz$

The frequency $(f)$ of a wave is the number of full wave forms generated per second. This is the same as the number of repetitions per second or the number of oscillations per second.
In this case, an object attached to one end of a spring makes $20$ vibrations in $10 s.$ That is, $20$ vibration in $10$ seconds. S in one second it makes $2$ vibrations.

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