1.

When two progressive waves y_(1) = 4 sin (2x - 6t) and y_(2) = 3 sin (2x -6t - (pi)/(2)) are superimposed, the amplitude of the resultant wave is ............. .

Answer»

5 m
10 m
20 m
40 m

Solution :SINCE`Delta phi = pi//2` ,
`A_("resultant ") = (A_(1)^(2) + A_(2)^(2) + 2A_(1) A_(2) cos Delta phi )^(1//2) `
=` sqrt((4)^(2) + (3)^(2))`= 5
So, correct choice is (b) .


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