I have a question on finding an expression on a sine wave could anybody point me in the right direction?

Question

I know that the expression is y(x,t)=Asin(kx - wt + phi). The other information I have is A=0.5cm, wave length = 2cm and the phase of the wave at t=0 and x=0 is pi/2. which bits out of the above equation do I omit for the phase of the wave pi/2. Thanks in advance

Answer 1

if the phase is pi/2 when x=0 and t=0 then phi = pi/2.

Now you need to find k and/or w , given the wavelength...