Displacement of a wave is expressed as x( t )=5 cos (628 t +(π)/2) m. The wavelength of the wave when its velocity is 300 m/s is: (π=3.14)

Displacement of a wave is expressed as $\displaystyle x(\mathrm{t})=5 \cos \left(628 \mathrm{t}+\frac{\pi}{2}\right) \mathrm{m}$. The wavelength of the wave when its velocity is $\displaystyle 300$ m/s is : $$(\pi=3.14) $$