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प्रश्न
State two applications of ultrasound.
लघु उत्तर
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उत्तर
- Ultrasound is used for drilling holes or making cuts of desired shape in materials like glass.
- Ultrasound is used in surgery to remove cataracts and in the kidneys to break the small stones into fine grains.
- Ultrasonic sound is used to detect flaws in metal castings used in automobile tyres.
- It is used in hospitals to detect defects in certain parts of the body.
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संबंधित प्रश्न
The sketches I to IV in following Figure show sound waves, all formed in the same time interval.
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| I | II |
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| III | IV |
Which diagram shows
- a note from a musical instrument
- a soft (or feeble) note,
- a bass (low frequency) note.
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.
 |
 |
 |
| (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:
Elephants produce ____________sound.
Name the sound of the frequency given below:
40 kHz
What is ultrasound?
State the approximate speed of ultrasound in air.
The properties of ultrasound that make it useful are
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1 hertz is equal to
