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A sound wave travels at 340 m/s with a frequency of 170 Hz. What is its wavelength?
A0.5 m
B2 m
C510 m
D57800 m
Answer & Solution
Correct answer: B. 2 m
1. Wave relation: $v = n\lambda$, so $\lambda = \dfrac{v}{n}$.
2. Substitute $v = 340\,\text{m/s}$ and $n = 170\,\text{Hz}$.
3. $\lambda = \dfrac{340}{170} = 2\,\text{m}$.
4. The value 57800 wrongly multiplies $v$ by $n$ instead of dividing.
_Source: Samacheer Kalvi (TN SCERT) Class 10 Science, Unit 5 Acoustics "Acoustics", p.67_
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