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प्रश्न
What are hearing aids?
उत्तर
A hearing aid is a device which increases the loudness and intensity of the incoming sound.
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संबंधित प्रश्न
Which has the higher frequency - ultrasonic sound or infrasonic sound?
Complete the following sentence:
Ultrasound is of frequency ___________.
Complete the following sentence:
Bats can produce and hear ___________ sound.
State the approximate speed of ultrasound in air.
What is Galton’s whistle? To what use is it put?
The sonic boom of an aircraft has a time period of 0.00005s. Calculate the frequency of sound produced.
An electromagnetic wave has a time period of 4 × 10-8 s. Calculate its frequency in MHz.
Ultraviolet radiation has a wavelength of 300Å. If the velocity of the electromagnetic wave is 3 × 108 ms-1. Calculate:
- frequency
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State the properties of ultrasound that make it useful.
