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amplitude - the maximum displacement of particles of the medium from its mean position in which wave passes .
     S.I. unit of amplitude -  meter  ( m ) 

pitch -  two or more sounds having same loudness or amplitude can be characterized as the pitch .
                pitch of the sound depends on frequency . higher the frequency higher be the pitch . two or more sounds having same loudness or amplitude .
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1.amplitude-the maximum displacement of the particles of the medium from their original mean position on passing a wave through the medium is called amplitude.
amplitude means the height of the crest or is denoted by letter A.
si unit=m (metre)

2.pitch- pitch is the characteristic of the wave which is related to the frequency.
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Si unit is that of the density or pressure of amplitude
density or pressure ?? it is the si unit of amplitude
Its written in class 9 ncert science