Waves Ques 19
19. 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: 19.(b)
Solution:
- (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 $(\lambda)=\frac{v}{n}=\frac{760}{30}=25.3 m$
BETA
