The sound of which of the following frequencies are audible to liuman ears: 2 Hz, 5 Hz, 20 Hz, 200 Hz, 2000 Hz.
Q. (a) The sound of which of the following frequencies are audible to liuman ears: 2 Hz, 5 Hz, 20 Hz, 200 Hz, 2000 Hz.
(b) How moths of certain families are able to escape capture?
Ans. (a) 20 Hz, 200 Hz and 2000 Hz.
(b) They do not reflect the ultrasounds sent towards them by bats.
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