Question

what is high pitched sound & low pitched sound?

Answer 1

pitch of the sound depends upon the frequency
so if the frequency is high the pitch will also be high
if the frequency is low the pitch will also be low

I think this answer would be helpful

Answer 2

The pitch of the sound vibrating with low frequency is low which is low pitched sound.

The pitch of the sound vibrating with greater frequency is more which is high ptched sound.