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प्रश्न
How is an ultrasound scan for fetus (unborn baby) better than X-ray ?
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
Give two practical applications of reflection of sound waves.
How does the pitch of a sound depend on frequency ?
What type of scans are used these days to monitor the growth of developing baby in the uterus of the mother ?
What is the name of the device which is used to find the depth of sea (or ocean) by using ultrasonic sound waves ?
Write the full name of 'SONAR'.
What name is given to sound waves of frequencies higher than 20 kHz ?
Fill in the blank with suitable word :
Pitch of sound depends on ....................
Draw labelled diagrams to represent (a) soft sound, and (b) loud sound, of the same frequency.
Draw labelled diagrams to represent sound of (a) low pitch, and (b) high pitch, of the same loudness.
Explain how, bats use ultrasound to catch the prey.
