Waves - Result Question 66
68. A wave has S.H.M whose period is 4 seconds while another wave which also possess SHM has its period 3 seconds. If both are combined, then the resultant wave will have the period equal to
(a) 4 seconds
(b) 5 seconds
(c) 12 seconds
(d) 3 seconds
[1993]
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Answer:
Correct Answer: 68. (c)
Solution:
- (c) Beats are produced. Frequency of beats will be $\frac{1}{3}-\frac{1}{4}=\frac{1}{12}$. Hence time period $=12 s$.
Beat period (T) is the time interval between two successive beats.
$ T=\frac{1}{\text{ Beat frequency }}=\frac{1}{n_1-n_2} $
