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प्रश्न
State four practical uses of ultrasonic vibrations.
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 sentence:
Bats can produce and hear ___________ sound.
Name the sound of the frequency given below:
100 Hz
State the approximate speed of ultrasound in air.
A man can hear the sound of frequency :
The properties of ultrasound that make it useful are
What do you understand by the term ultrasonic vibrations?
The sonic boom of an aircraft has a time period of 0.00005s. Calculate the frequency of sound produced.
State the properties of ultrasound that make it useful.
1 hertz is equal to
