Waves - Result Question 24

24. The speed of a wave in a medium is $760 m / s$. If 3600 waves are passing through a point in the medium in $2 min$, then their wavelength is

[1995]

(a) $13.8 m$

(b) $25.3 m$

(c) $41.5 m$

(d) $57.2 m$

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Answer:

Correct Answer: 24. (b)

Solution:

  1. (b) Speed of the wave $(v)=760 m / s$;

Number of waves $=3600$

and time taken $(t)=2 min=120 sec$.

Frequecny of waves

(n) $=\frac{3600}{120}=30 / sec$.

$\therefore$ wavelength of waves $(\lambda)=\frac{v}{n}=\frac{760}{30}=25.3 m$