EVERYDAY SCIENCE

SCIENCE

PHYSICS

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Sound waves with frequencies lower than the lowest limits of human hearing are called.
A
Echosonic waves
B
Infrasonic waves
C
Supersonic waves
D
None of these
Explanation: 

Detailed explanation-1: -Sound at 20-200 Hz is called low-frequency sound, while for sound below 20 Hz the term infrasound is used. The hearing becomes gradually less sensitive for decreasing frequency, but despite the general understanding that infrasound is inaudible, humans can perceive infrasound, if the level is sufficiently high.

Detailed explanation-2: -Sounds with a frequency of 20 Hz and lower are called infrasound. Low frequency sound is understood to mean sound, the frequency of which is below 125 Hz. Infrasound and low frequency sound are difficult to hear, but they cannot be called completely inaudible.

Detailed explanation-3: -At the other end of the spectrum are very low-frequency sounds (below 20 Hz), known as infrasound. Elephants use infrasound for communication, making sounds too low for humans to hear. Because low frequency sounds travel farther than high frequency ones, infrasound is ideal for communicating over long distances.

Detailed explanation-4: -infrasonics, vibrational or stress waves in elastic media, having a frequency below those of sound waves that can be detected by the human ear-i.e., below 20 hertz. The range of frequencies extends down to geologic vibrations that complete one cycle in 100 seconds or longer.

Detailed explanation-5: -Sound waves of frequency less than 20 Hz which can’t be heard by us are called infrasonic waves.

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