A stone is swinging in a horizontal circle of diameter `0.8m` at `30 rev//min`. A distant light causes a shadow of the stone on a nearly wall. The amplitude and period of the SHM for the shadow of the stone are

Options

A. `0.4m, 4s`
B. `0.2m, 2s`
C. `0.4m, 2s`
D. `0.8m, 2s`

Answer

C

Explanation

`A = radius = ("Diameter")/(2) = 0.4m`
`f = (30)/(60) = (1)/(2)rps` or `(1)/(2)Hz `
`:. T = (1)/(f) = 2s`.