Voice of which of the following creatures is likely to have maximum frequency ?
Man
Cow
Bird
Dog
Among the four creatures birds voice has higher pitch than other three. Higher pitch means higher frequency. Pitch determines the shrillness of sound.
It has been seen that the behaviour of animals becomes unusual just before the tremor is felt.what is the reason behind this?
Because animals are able to detect infrasonic waves produced at the time of tremor.
Because animals are able to detect ultrasonic waves produced at the time of tremor.
Because animals are able to detect audible waves produced at the time of tremor.
All
Has been seen that the behaviour of animals becomes unusual just before the tremor is felt.This is because animals are able to detect infrasonic waves produced at the time of tremor. Infrasonic waves are waves of frequency less than 20Hz.