The speed of propagation of a wave in a medium is `300m//s`. The equation of motion of point at `x = 0` is given by `y = 0.04 sin 600 pit(metre)`. The displacement of a point `x=75cm` at `t=0.01 s` is

Options

A. `0.02m`
B. `0.04m`
C. `zero`
D. 0.028 m

Answer

B

Explanation

The equation of motion of a point at x=75cm is y=0.04sin`(600pit+1.5pi)` or 0.04`sin(600pit-1.5pi)`
`implies ` At `t=0.01,y(at " "x=75cm)=0.04sin(7.5pi) or 0.04 sin(4.5) implies y=0.04or -0.04 m`