What are its wavelength and frequency?

[lostie100]

A wave travels with speed 200m/s. Its wave number is 1.5rad/m. What are its wavelength and frequency?

distance = wavelength x # of wavelengths
v=lamda(f)

1m = 1.5 (lamda) since in 1 meter there was 1.5 waves. 1/1.5 = 0.66m

200 = 0.66 (f); f = 300Hz.

But this is wrong. I don't know why...

 

[Hootenanny]

A wave travels with speed 200m/s. Its wave number is 1.5rad/m. What are its wavelength and frequency?

distance = wavelength x # of wavelengths
v=lamda(f)

1m = 1.5 (lamda) since in 1 meter there was 1.5 waves. 1/1.5 = 0.66m

200 = 0.66 (f); f = 300Hz.

But this is wrong. I don't know why...

How many radians are there in a single cycle (wavelength)?