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CBSE Class 9 Answered

How does a hearing aid work?
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
answered-by-expert Expert Answer

A hearing aid is a battery operated electronic device. It receives sound through a microphone which converts the sound waves to electrical signals. These electrical signals are amplified by an amplifier and sent to speakers of hearing aid. The speaker converts the amplified electrical signal to sound and sends to the ear for clear hearing.

Answered by | 04 Jun, 2014, 03:23: 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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Sound creates vibrations in our ear. We listen sound and understand it. But after this in which form of energy does it gets converted into? 
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Why do animals like dogs etc get uneasy before earthquakes?
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Which part of the ear contains the actual hearing organ?
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Draw labelled diagram of auditory parts of human ear and explain how the human ear works.
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