Question

Choose the correct word from the bracket and fillin the blacks given in a paragraph.
(20 Hz, infrasound, audible, 20,000 Hz,  ultrasound,lower) Thelimitsofhearingofthehumanearare……………..to20,000Hz.That is,thehumanearcanhearsoundsoffrequenciesinthisrange.Thesesoundsare called…………..sounds.Ourearscannothearfrequencies……….than20Hzand higherthan………………..20kHz.Soundwithafrequencysmallerthan20Hzis called……………..Thesoundproducedbyapendulumandthesoundgeneratedby thevibrationsoftheearth’scrustjustbeforeanearthquakeareexamplesofsuch sounds. Sound waves with frequency greater than 20kHz are called ……………... ​

Answer 1

Answer:

1) 20Hz

2) audible sounds

3) lower

4) 20,000Hz

5) infrasound

6) ultrasound

Answer 2

Answer:

The limits of hearing in the human ear are 20HZ to 20,000. That is, the human ear can hear sounds of frequencies in this range. These sounds are called audible sounds. Our ears cannot hear frequencies lower than 20Hz and higher than 20,000Hz. Sound with a frequency smaller than 20Hz is called infrasound. The sound produced by a pendulum and the sound generated by the vibrations of the earth’s crust just before an earthquake are examples of such sounds. Sound waves with a frequency greater than 20kHz are called ultrasound. ​

Explanation:

Ultrasound is a term used to describe sounds that are above the human auditory range. Ultrasound is the same as all noises with frequencies greater than 20,000 Hz. Ultrasounds are undetectable by the human ear.

The term "infrasound" refers to all sound waves with frequencies below the lower hearing limit. The creatures communicate with one another through infrasonic sounds.

The range of frequencies that can be heard, is 20 Hz to 20,000 Hz.

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