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Question
What are hearing aids?
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Solution
A hearing aid is a device which increases the loudness and intensity of the incoming sound.
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RELATED QUESTIONS
A microphone is connected to the Y-input of a C.R.O Three different sounds are made in turn in front of the microphone. Their traces (a), (b) and (c) produces on the screen are shown in following figure.
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| (a) | (b) | (c) |
- Which trace is due to the loudest sound? Give reason for your answer.
- Which trace is due for the sound with the lowest pitch? Explain your answer.
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Ultrasound is of frequency ___________.
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40 kHz
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