The wave described by `y = 0.25 "sin"(10 pi x - 2pit)` , where x and y are in metres and t in seconds , is a wave travelling along the:
A. negative x-direction with frequency 1 Hz
B. Postive x- direction with frequency pi Hz and wavelength` lambda = 0.2 m`
C. positive x- direction whith frequency 1 Hz and wavelength `lambda=0.2 m`
D. negative x - direction with amplitude 0.25 m and wavelength `lambda = 0.2 m`
