Waves - Result Question 66

«««< HEAD:content/english/neet-pyq-chapterwise/physics/waves/waves-result-question-66.md

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

======= ####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

3e0f7ab6f6a50373c3f2dbda6ca2533482a77bed:content/english/neet-pyq-chapterwise/physics/waves/waves—result-question-66.md (a) 4 seconds

(b) 5 seconds

(c) 12 seconds

(d) 3 seconds

[1993]

Show Answer

Answer:

Correct Answer: 68. (c)

Solution:

  1. (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} $