What are hearing aids?

एक पंक्ति में उत्तर

A hearing aid is a device which increases the loudness and intensity of the incoming sound.

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अध्याय 7: Sound - Range of Hearing [पृष्ठ २८४]

अध्याय 7 Sound
Range of Hearing | Q 18 | पृष्ठ २८४

Name the sound of the frequency given below:

10 Hz

What is ultrasound?

A man can hear the sound of frequency :

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

What do you understand by the term ultrasonic vibrations?

Name three animals which can hear ultrasonic vibrations.

Ultraviolet radiation has a wavelength of 300Å. If the velocity of the electromagnetic wave is 3 × 10⁸ ms^-1. Calculate:

What are ultrasonic?

Ultrasound has frequency of vibration

The range of audible frequency for the human ear is