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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
Fill in the blank with suitable word .
Sound waves are caused by ...................
Name the three characteristics of sound.
How does the pitch of a sound depend on frequency ?
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 happens to the loudness of a sound if its amplitude decreases ?
What name is given to sound waves of frequencies higher than 20 kHz ?
What is meant by the quality (or timbre) of sound ? On what factor does the quality (or timbre) of a sound depend ?
The ultrasound waves can penetrate into matter to a large extent because they have :
Fill in the blank and explain.
To discover a sunken ship or objects deep inside the sea, ______ technology is used.
