Question

1. Give reasons.
(a) A metal plate falling on a ground produces noise.
(b) A person standing at a point 12m from a wall produces an echo will not hear it.
(c) The frequencies 399.99Hz, 783.98Hz and 1175,97Hz are of a musical note.
(d) Two separate taps on a pillar of the Vitthala temple at Hampi, Karnataka, produces sounds having frequency 168Hz and 112Hz. What kind of a sound it will be? Why?
(e) Certain sounds are not audible to us even if they are loud. Explain.

Answer 1

Dear friend,these are the answers:
1.It is so because metals are sonorous.
2.It is so because he can only hear the voice if he is standing near the wall because the voice cant bounce back so far.
3.Don't know.
4.Don't know.
5.It is so because a human ear can't listen voices less than 20 Hz and more than 20,000 Hz.

Answer 2

Answer:

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