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A sound wave of wavelength 0.20 m travels at a speed of 331 m/s. What is its frequency?
A66.2 Hz
B165.5 Hz
C1655 Hz
D662 Hz
Answer & Solution
Correct answer: C. 1655 Hz
1. From $v = n\lambda$, frequency $n = \dfrac{v}{\lambda}$.
2. Substitute $v = 331\,\text{m/s}$ and $\lambda = 0.20\,\text{m}$.
3. $n = \dfrac{331}{0.20} = 1655\,\text{Hz}$.
4. The value 66.2 wrongly multiplies instead of dividing.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 5 Acoustics "Acoustics", p.78_
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