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प्रश्न
What are hearing aids?
एका वाक्यात उत्तर
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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.
Name the sound of the frequency given below:
40 kHz
What is ultrasound?
Explain how do bats locate the obstacles and prey in their way.
Name three animals which can hear ultrasonic vibrations.
Does SONAR make use of infrasonic sound?
Is the energy carried by the ultrasound very high or very low?
What is echocardiography?
