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CBSE Class 9 Answered

HOW CAN WE DEFINE COMPRESSION AND RARE FRACTION ?
Asked by Denith Lekshmi | 19 Nov, 2013, 06:14: PM
answered-by-expert Expert Answer
Longitudional waves results from the back and forth vibrationas of the particles of the medium through which sound waves are moving.
 
Compressions
Regions in the medium where the air particles are compressed/closest togather are called compressions. In this region air pressure is high.
 
Rarefractions 
These are the regions where air particles are speard apart. Rarefractions are the regions where the pressure is low.
Answered by Komal Parmar | 19 Nov, 2013, 07:08: 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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