The wave described by y `= 0.25 sin ( 10 pix -2pi nt )` where x and y are in meters and t in seconds , is a wave travelling along the

Options

A. Positive x direction with frequency 1 Hz and wavelength `lambda=0.2m`
B. Negative x direction with amplitude 0.25 m and wavelength `lambda=0.2m`
C. Negative x direction with frequency 1 Hz
D. Positive x direction with frequency `pi` Hz and wavelength `lambda=0.2m`

Answer

A

Explanation

`y=0.25sin(10pix-2pit)`
`lambda=(2pi)/(k)=(2pi)/(10pi)=0.2m`
`f=(omega)/(2pi)=(2pi)/(2pi)=1Hz`.