Question

difference bw amplitude and frequency

Answer 1

Amplitude and wavelength are both measures of distance. The amplitudemeasures the height of the crest of the wave from the midline. The wavelength measures the horizontal distancebetween cycles. The frequency is just the opposite; it's the number of wave cycles that are completed in one second.
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Answer 2

Amplitude: The maximum displacement, of a vibrating body, on either side, is called its amplitude.  

It is used to describe the size of the wave.

The amplitude of a wave is the same as the amplitude of the vibrating body producing the sound.

It's S.I unit is metre (m).

Frequency : The vibrating body completes a fixed number of cycles of vibration on one second. This number is known as its frequency.  

The frequency wave is fixed and does not change even when it passes through a different substance.

It's S.I unit is Hertz (Hz).