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What are ultrasonics?...

What are ultrasonics?

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Human beings can hear ultrasonic sound.

Vibrations generated by earthquakes produce ultrasonic sound.

Knowledge Check

  • A micro-wave and an ultrasonic sound wave have the same wavelength. Their frequencies are in the ratio (approximately)

    A
    `10^(2)`
    B
    `10^(4)`
    C
    `10^(6)`
    D
    `10^(8)`

  • A bat emits ultrasonic sound of frequency 100 kHz in air. If this sound meets a water surface, the wavelengths of the reflected and transmitted sound are (Speed of sound in air = 340 m s^(-1) and in water = 1500 m s^(-1) )

    A
    3.4 mm, 30 mm
    B
    6.8 mm, 15 mm
    C
    3.4 mm, 15 mm
    D
    6.8 mm, 30 mm

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    Name three animals who use ultrasonic waves. Explain atleast one animal which uses ultrasonic waves.

    Distinguish between Infrasonic and ultrasonic sound .

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