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प्रश्न
What are ultrasonic? State and explain two applications of ultrasounds.
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उत्तर
Ultrasonic sound is the sound having frequency more than 20KHz. The application of ultrasonic sound is as follows:
(i) It is used to detect the flaws in metal casting of automobile tyres.
(ii) Used in hospitals to detect defects in certain parts of the body.
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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:
Ultrasound is of frequency ___________.
Complete the following sentence:
Infrasonic sound is of frequency ______________.
Complete the following sentence:
Bats can produce and hear ___________ sound.
Name the sound of the frequency given below:
1000 Hz
What do you understand by the term ultrasonic vibrations?
State four practical uses of ultrasonic vibrations.
What does SONAR stand for?
1 hertz is equal to
Bats produce ______ sound during screaming.
