Waves Ques 25
25. Sound waves travel at $350$ $ m / s$ through a warm air and at $3500 $ $m / s$ through brass. The wavelength of a $700$ $ Hz$ acoustic wave as it enters brass from warm air
[2011]
(a) decreases by a factor $10$
(b) increases by a factor $20$
(c) increases by a factor $10$
(d) decreases by a factor $20$
Show Answer
Answer:
Correct Answer: 25.(c)
Solution:
- (c) We have, $v=n \lambda$
$\Rightarrow v \propto \lambda$ (as $n$ remains constant)
Thus, as $v$ increases $10$ times, $\lambda$ also increases $10$ times.
BETA
