State the main components of a hearing aid.

One Line Answer

The main components of hearing aid are microphone , amplifier and earphone.

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Chapter 7 Sound
Range of Hearing | Q 19 | Page 284

Name the sound of the frequency given below:

40 kHz

What is ultrasound?

State the approximate speed of ultrasound in air.

The properties of ultrasound that make it useful are

What do you understand by the term sonic vibrations? State the range of sonic vibrations for the human ear.

What is Galton’s whistle? To what use is it put?

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:

What are ultrasonic?

What is echocardiography?