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प्रश्न
State four practical uses of ultrasonic vibrations.
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उत्तर
Uses of ultrasonic vibrations:
- These are used for dissipating fogs on the runways at the airports.
- These are used in the ultrasound scanning of internal organs of human body.
- These are used for making dish washing machines. In these machines, water and detergents are vibrated with ultrasonics vibrator. The vibrating particles of the dissolved detergent rub against the plates and clean them.
- These are used in SONAR (Sound navigation and ranging) to detect and find the distance of objects under water.
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संबंधित प्रश्न
A microphone is connected to the Y-input of a C.R.O Three different sounds are made in turn in front of the microphone. Their traces (a), (b) and (c) produces on the screen are shown in following figure.
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| (a) | (b) | (c) |
- Which trace is due to the loudest sound? Give reason for your answer.
- Which trace is due for the sound with the lowest pitch? Explain your answer.
Complete the following sentences:
An average person can hear sound of frequencies in the range ______ to _________.
What is ultrasound?
Explain how do bats locate the obstacles and prey in their way.
State two applications of ultrasound.
A man can hear the sound of frequency :
The properties of ultrasound that make it useful are
Ultraviolet radiation has a wavelength of 300Å. If the velocity of the electromagnetic wave is 3 × 108 ms-1. Calculate:
- frequency
- time period.
Does SONAR make use of infrasonic sound?
What are hearing aids?
