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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 sentence:
Bats can produce and hear ___________ sound.
Name the sound of the frequency given below:
10 Hz
Name the sound of the frequency given below:
100 Hz
Name the sound of the frequency given below:
1000 Hz
What is ultrasound?
The properties of ultrasound that make it useful are
What are ultrasonic? State and explain two applications of ultrasounds.
What does SONAR stand for? Where do we make use of SONAR?
The range of audible frequency for the human ear is
