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प्रश्न
How is an ultrasound scan for fetus (unborn baby) better than X-ray ?
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उत्तर
An ultrasound scan for fetus is better than X-rays because X-rays can damage the delicate body cells of the fetus.
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संबंधित प्रश्न
Explain how defects in a metal block can be detected using ultrasound.
Name the characteristic of sound which depends on (a) amplitude (b) frequency, and (c) waveform.
What happens to the pitch of a sound if its frequency increases ?
What name is given to sound waves of frequencies higher than 20 kHz ?
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Explain the term 'pitch' of a sound. On what factor does the 'pitch' of a sound depend ?
Give one use of ultrasound in industry and one in hospitals.
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