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The sound waves which cannot be heard by a human ear are called.
A. Ultrasonic Sounds
B. Infrasonic Sounds
C. Extraordinary Sounds
D. Both (a) and (c)

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Last updated date: 28th Mar 2024
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MVSAT 2024
Answer
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Hint: To solve this problem first we need to know about sound and what are its properties, we will also need the knowledge of types of sound then it would be easy for us to reach our conclusion for this question.

Complete step by step answer:
With the help of physics we know that sound is a vibration that propagates as a wave, through a transmission medium such as a gas, liquid or solid.

TYPES OF SOUND-
Ultrasonic Sound
Sound which is above the frequency of 20000 Hz is known as ultrasound. Most likely humans cannot hear the ultrasonic sound but many animals such as dogs, bats, monkeys, etc. can hear ultrasound.

Infrasound
Sound waves with frequencies lower than 20 Hz are known as Infrasound. But sounds of such low frequency are too low for humans to hear animals such as whales, elephants and other animals can detect infrasound and use it to communicate. We normally detect volcanic eruptions and these sounds are used in some types of music.

The range of the Human ear is 20Hz to 20KHz.
Both the Ultrasonic and Extraordinary sounds are out of this range but infrasonic sound is near to 20 Hz and can be heard by humans but with difficulty.

So, the correct answer is “Option D”.

Note: Hence we know that sound is very important for humans as well as animals as with the help of sound many mammals such as bats and dolphins hunt their preys with the help of ultrasonic sounds, more likely sound helps humans to have contact with each other as a form of conversation which is an important as aspect for humans.