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प्रश्न
What are ultrasonic?
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उत्तर
Ultrasonic are sounds having frequency higher that 20 KHz and not audible to the human being.
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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.
Name the sound of the frequency given below:
1000 Hz
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- time period.
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