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CBSE Class 9 Answered

How is ultrasound used in various industries?
Asked by Topperlearning User | 31 Mar, 2014, 07:23: AM
answered-by-expert Expert Answer
Ultrasound can be used for various commercial uses as follows:
1)Ultrasound is used in industry for detecting flaws (cracks, etc) in metal blocks. If there is a crack in metal block then ultrasounds get reflected and do not reach the ultrasound detector, thereby indicating a flaw.
2)Ultrasound is used in medical industry to investigate internal organs of the human body such as liver, gall bladder, uterus, kidneys, pancreas, heart, etc.
3)Ultrasound is also used to remove kidney stones by first breaking the kidney stones into fine granules which then could pass through urine.
4)Ultrasound is also now a days used extensively to see the well being of foetus (unborn child) inside the mother’s uterus.
5)Ultrasound is used in sonar apparatus to measure the depth of sea and to locate objects under sea like shipwrecks, submarines, sea rocks, hidden ice-bergs etc.
Answered by | 31 Mar, 2014, 09:23: AM

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CBSE 9 - Physics
(3 X 3 = 9) CASE STUDY QUESTION 26. Ultrasounds can be used to detect cracks and flaws in metal blocks. Metallic components that are generally used in construction of big structures like buildings, machines and also scientific equipment. The cracks or holes inside metal blocks, which are invisible from outside, reduce the strength of the structure. Ultrasonic waves are allowed to pass through the metal block and detectors are used to detect the transmitted waves. If there is even a small defect, the ultrasound gets reflected back indicating the presence of flaw or defect. Clearly indicated in the figure Defect or flaw Ultrasound Detectors Metal Block (a) The transmitter sends an ultrasound wave of speed 5960m/s through a long steel bridge and a block reflects it back after 0.02s. how far the block in the metal bridge is from the transmitter. (b) With the above property of ultrasound waves, Can ultrasonic waves be used in the medical field? If so, how and give one use in the medical field to justify your answer? (c) Give two practical applications of reflection of sound waves?
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