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CBSE Class 9 Answered

velocity starting from rest is directly proportional to time
Asked by Abhinavgupta | 10 Jun, 2008, 02:04: AM
answered-by-expert Expert Answer

You have asked extremely intelligent question and we would like to understand where you are getting stuck on this question, once we are clear, we would be able to explain things better.

Answered by | 13 Jun, 2008, 07:26: PM

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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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CBSE 9 - Physics
What is the SI Unit of "Intensity of Sound"?
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what is reverabation
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CBSE 9 - Physics
what is tuning fork 
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