The velocity of waves having wavelength 0.643 m and frequency 3.25 e 10 hz is

The relationship between velocity (v), wavelength (w) and frequency (f) is expressed as:

v = w f

Plugging in the given values into the equation:

v = 0.643 m (3.25 e 10 Hz)

Where Hz = 1 / s, therefore:

v = 0.643 m (3.25 e 10 / s)

v = 2.09 e 10 m / s