A simple harmonic progressive wave has a wavelength 40 cm, periodic time 10 s and zero initial phase. What is the phase of an oscillating particles at a distane of 10 cm form the source at an instant t = 5s ?

Options

A. `(pi)/(6)` radian
B. `(pi)/(4)` radian
C. `(pi)/(3)` radian
D. `(pi)/(2)` radian

Answer

D

Explanation

`y = A sin 2pi ((t)/(T) - (x)/(lamda))`
Phase of the particle `= 2pi ((t)/(T) - (x)/(lamda))`
`= 2pi ((5)/(10) - (10)/(40)) = (pi)/(2)`