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CBSE Class 9 Answered

what is the nature of clock in the space ?
Asked by R.S.CHAUHAN | 01 Feb, 2016, 08:59: PM
answered-by-expert Expert Answer
A clock either runs on a battery or some spring and gear mechanism. In any case it does not matter whether the clock is placed on Earth or in space it will run in the same fashion.
 
The only difference comes due to motion of the spaceship in which the clock is placed. The time shown by the clock in spaceship will be different from that on the earth because time slows down in moving frames of reference. 
Answered by Romal Bhansali | 02 Feb, 2016, 10:47: 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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