A wave has S.H.M whose period is 4 seconds while another

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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

1. 4 seconds
2. 5 seconds
3. 12 seconds
4. 3 seconds

Correct Option: C

Beats are produced. Frequency of beats will be

	1	-	1	=	12
	3		4		12

Hence time period = 12 s.