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匿名 發問於 科學及數學物理學 · 3 年前

Physics frequency order http://upload.lsforum.net/users/public/w349222t72.png?

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  • 天同
    Lv 7
    3 年前
    最愛解答

    Frequency of,

    - 5 GHz radar = 5 x 10^9 Hz

    - 3 micron infrared radiation = 3 x 10^8/3 x 10^-6 Hz = 10^14 Hz

    [where 3 x 10^8 m/s is the speed of light ]

    - 20 kHz sonar = 20 x 10^3 Hz = 2 x 10^4 Hz

    - 4 kHz of sound = 4 x 10^3 Hz

    - blue light = 3 x 10^8/450 x 10^-9 Hz = 6.67 x 10^14 Hz

    [ Take the wavelength of blue light be 450 nm]

    - 2000m radio = 3 x 10^8/2000 Hz = 150 kHz = 1.5 x 10^5 Hz

    Therefore, the frequencies in ascending order is:

    4 kHz sound ( 4 x 10^3 Hz)

    20 kHz sonar ( 2 x 10^4 Hz)

    2000m radio ( 1.5 x 10^5 Hz)

    5 GHz radar ( 5 x 10^9 Hz)

    3 micron infrared ( 10^14 Hz)

    blue light ( 6.67 x 10^14 Hz)

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