10 beats/s are produced by the super position of two sound waves. If equation of the first wave is `y_(1) = 5 sin 20pi (30 t)`, then the equation of second wave is

Options

A. `y_(2) = 5 sin 20pi (31t)`
B. `y_(2) = 5 sin 20 pi (30t)`
C. `y_(2) = 5 sin 20pi (32t)`
D. `y_(2) = 5 sin 21 pi (31t)`

Answer

A

Explanation

`omega_(1) = 20 pi xx 30`
`2pi n_(1) = 20 xx 30pi = 300`
`n = n_(2) - n_(1)`
`n_(2) = n + n_(1)`
`= 10 + 300 = 310`