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प्रश्न
What are ultrasonic waves ? Name two animals which can produce ultrasonic waves.
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उत्तर
Ultrasonic sound waves have frequencies higher than 20 kHz. It is inaudible as its frequency lies above the human audible range of frequencies (20 Hz–20 kHz). These sounds are produced by objects vibrating very rapidly. Bats and dolphins can produce these sounds.
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संबंधित प्रश्न
What is the audible range of the average human ear?
Fill in the blanks with suitable words.
A sound wave consists of places of higher pressure called ................. and places of................pressure called.................
Can we hear (a) infrasonic waves (b) ultrasonic waves ?
What type of sound waves are produced by a vibrating simple pendulum ?
What is the difference between infrasonic waves and ultrasonic waves ?
Choose the infrasonic waves and ultrasonic waves from the following frequencies :
(i) 10,000 Hz
(ii) 30,000 Hz
(iii) 18 Hz
(iv) 50,000 Hz
(v) 10 Hz
What are infrasonic waves ? Name two animals which produce infrasonic waves.
The audible range of frequencies of an average human ear is from 20 Hz to 20 kHz. Calculate the corresponding wavelengths. (Speed of sound in air is 344 ms–1)
One of the following can hear infrasound. This one is :
Which of the above two graphs (a) and (b) (Fig.12.3) representing the human voice is likely to be the male voice? Give a reason for your answer.
