Wave Mechanics Question 808
Question: The wavelength of ultrasonic waves in air is of the order of
[EAMCET 1989]
Options:
A) $ 5\times {{10}^{-5}},cm $
B) $ 5\times {{10}^{-8}},cm $
C) $ 5\times 10^{5},cm $
D) $ 5\times 10^{8},cm $
Show Answer
Answer:
Correct Answer: A
Solution:
$ \lambda =\frac{v}{n},;,n\approx 50,000,Hz $ , $ v=330 $ m/sec
Therefore $ \lambda =\frac{330}{50000}m $
$ =6.6\times {{10}^{-5}}cm\approx 5\times {{10}^{-5}}cm $
BETA
