Question

a wave has SHM whose period is 4 s while another wave which also possess SHM has its period 3 s . if both are combined ,then the resultant wave will have the period equal to

Answer 1

Time period for first wave
t1 = 4 Sec

Time period for Second wave
t2 = 3 Sec

Let time period of resultant wave be T

thus 

T = root [t1^2 + t2^2 ]
    = root [ 16 + 9 ]
     = root [ 25 ]
= 5
thus  resultant time period = 5 Sec