Question

Wave has simple harmonic motion whose period is 4 seconds while another wave which also possesses simple harmonic motion has its period 3 sec. If both are combined, then the resultant wave will have the period equal to

• A. 4 sec
• B. 5 sec
• C. 12 sec
• D. 3 sec

Answer 1

Answer: (C)

12 sec

Answer 2

Beats are produced. Frequency of beats will
be $\frac{1}{3}-\frac{1}{4}=\frac{1}{12}$ Hence time period = 12 s