Waves - Result Question 21
21. The equation of a sound wave is given as: $y=0.0015 \sin (62.4 x+316 t)$. The wavelength of this wave is
[1996]
(a) 0.4 unit
(b) 0.3 unit
(c) 0.2 unit
(d) 0.1 unit
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Answer:
Correct Answer: 21. (d)
Solution:
- (d) $y=0.0015 \sin (62.4 x+316 t)$
On comparing with $y=A \sin (\omega t+k x)$
$\omega=316, k=62.4$
$\Rightarrow k=\frac{2 \pi}{\lambda}=62.4 \Rightarrow \lambda=0.1$ unit
