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प्रश्न
State the main components of a hearing aid.
एका वाक्यात उत्तर
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उत्तर
The main components of hearing aid are microphone , amplifier and earphone.
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संबंधित प्रश्न
Complete the following sentences:
An average person can hear sound of frequencies in the range ______ to _________.
Complete the following sentence:
Ultrasound is of frequency ___________.
Name the sound of the frequency given below:
10 Hz
The properties of ultrasound that make it useful are
Sonar makes use of :
What is Galton’s whistle? To what use is it put?
State four practical uses of ultrasonic vibrations.
Ultraviolet radiation has a wavelength of 300Å. If the velocity of the electromagnetic wave is 3 × 108 ms-1. Calculate:
- frequency
- time period.
What does SONAR stand for?
Is the energy carried by the ultrasound very high or very low?
