waves

q17 ans b

Maximum number of beats = v + 1  (v  1) =2


@raj1213
how you made the final conclusion

@raj1213 cos 2πt will come in bracket
@NishantThakre number of beats will be the reciprocal of time interval between 2 successive maxima.... Put A=( 2 cos2πt +1)
To get the equation in general form.