Advertisements
Advertisements
Question
How is an ultrasound scan for fetus (unborn baby) better than X-ray ?
Advertisements
Solution
An ultrasound scan for fetus is better than X-rays because X-rays can damage the delicate body cells of the fetus.
APPEARS IN
RELATED QUESTIONS
A submarine emits a sonar pulse, which returns from an underwater cliff in 1.02 s. If the speed of sound in salt water is 1531 m/s, how far away is the cliff?
Explain how bats use ultrasound to catch a prey.
Explain how defects in a metal block can be detected using ultrasound.
Define the 'frequency' and 'time-period' of a wave. What is the relation between the two?
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.
Give one use of ultrasound in industry and one in hospitals.
Name an animal which navigates and finds food by ecolocation.
A sonar station picks up a return signal after 3 seconds. How far away is the object ? (Speed of sound in water = 1440 m/s).
