The wave described y = 0.25 sin (10$\mathrm{\pi }$x–2$\mathrm{\pi }$t) by, where x and y are in meter and t in second, is a wave travelling along the

–ve x direction with frequency 1 Hz

+ve x direction with frequency $\mathrm{\pi }$Hz and wavelength $\lambda$= 0.2m

–ve x direction with amplitude 0.25 m and wavelength $\mathrm{\lambda }$ = 0.2m

+ve x direction with frequency 1 Hz and wavelength $\mathrm{\lambda }$ = 0.2m