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The sounds of frequencies greater than 2...

The sounds of frequencies greater than 20 kHz are called ultrasonic sounds.

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The sounds with frequencies greater than 20 kHz are called ultrasounds.
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The sounds of frequencies greater than _____ are called ultrasonic sounds.

Ultrasonic and Infrasonic Waves: The sound having frequency 20 Hz to 20 KHz is called audible sound Human ear cannot hear sound of frequencies lying outside this range. The limits of audibility of sound vary from individual. Generally the upper limit decreases with increase of age of individual, usually and people can not hear sound of frequency more than 15 kHz. Sound of frequencies below 20 Hz are called infrasonics, while frequencies beyond 20 kHz are called ultrasonics. Ultrasonics can be heard by dogs, cat bats etc. Bats detect the path by means of ultrasonics. Ultrasonics can be used for diagnosis of tumour and other abnormalities within our body. This is known as ultrasonography. Ultrasonics are used to curve various diseases and to measure depth of oceans to detect submarines. If speed of infrasonics, a audible and ultrasonics waves are v_(i),v_(a)andv_(u) then

Ultrasonic and Infrasonic Waves: The sound having frequency 20 Hz to 20 KHz is called audible sound Human ear cannot hear sound of frequencies lying outside this range. The limits of audibility of sound vary from individual. Generally the upper limit decreases with increase of age of individual, usually and people can not hear sound of frequency more than 15 kHz. Sound of frequencies below 20 Hz are called infrasonics, while frequencies beyond 20 kHz are called ultrasonics. Ultrasonics can be heard by dogs, cat bats etc. Bats detect the path by means of ultrasonics. Ultrasonics can be used for diagnosis of tumour and other abnormalities within our body. This is known as ultrasonography. Ultrasonics are used to curve various diseases and to measure depth of oceans to detect submarines. The waves produced by simple pendulum (having time period 2 seconds) are

PEARSON IIT JEE FOUNDATION-SOUND-CONCEPT APPLICATION (LEVEL-1)
  1. If a body vibrates 20 times in a second, then its frequency is 20 Hz.

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  2. Sitar, veena and guitar are some instruments.

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  3. The sounds of frequencies greater than 20 kHz are called ultrasonic so...

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  4. Sound travels much faster than light in a given medium.

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  5. The velocity of sound is more in vacuum than in any other medium.

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  6. In general, the voice of a woman has a higher frequency than that of a...

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  7. 1 kHz = Hz.

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  8. The vibratory motion of a tuning fork is in nature.

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  9. The time period of a simple pendulum is independent of of oscillation...

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  10. The loudness of sound is determined by its

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  11. sound is used as a diagnostic tool in medical science.

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  12. Sound needs a to travel.

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  13. Humans are sensitive to sound of loudness from to .

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  14. The loudness of sound with increase in the energy spent to vibrate a ...

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  15. Propagation of sound can be visualized as propagation of in the mediu...

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  16. A frequency of 1 Hz means oscillations per second.

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  17. Ultrasonic sound waves are used in

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  18. The sound produced by a siren given by a company reaches a person on t...

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  19. The velocity of a wave is 220 ms^(-1), the distance travelled by the w...

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  20. An echo of sound produced by a person, is heard from a distant tower a...

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