The relation is , we know , the number of full vibrations completed in 1 second is called frequency. Again , the distance traveled by a wave during 1 full vibration is called the wavelength. So if the wavelength is ,, the distance traveled by the wave at the time of 1 full vibration is = λ f ,, ,, ,, ,, ,, ,, f = λ Since , the frequency is f, so f full wave is created in 1 second so in 1 second The distance traveled by the wave = f This is the wave velocity v. Thus wave velocity , v = f