Wave Mechanics Question 709
Question: A wave of frequency 100 Hz is sent along a string towards a fixed end. When this wave travels back after reflection, a node is formed at a distance of 10 cm from the fixed end of the string. The speed of incident (and reflected) wave are
[CBSE PMT 1994]
Options:
A) 40 m/s
B) 20 m/s
C) 10 m/s
D) 5 m/s
Show Answer
Answer:
Correct Answer: B
Solution:
At fixed end node is formed and distance between two consecutive nodes $ \frac{\lambda }{2}=10 $
$ cm $
$ \Rightarrow $ $ \lambda =20 $
$ cm $
$ \Rightarrow $ $ v=n\lambda =20 $ m/sec
BETA
