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  1. Temperature of distant luminous bodies can be determined by

    2. A.

     Mercury thermometers
    B.

     Gas thermometers
    C.

     Pyrometers
    D.

     Colour thermometers

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    Answer : Option C

    Explanation :

    A pyrometer is a type of remote-sensing thermometer used to measure the temperature of a surface. It is a device that from a distance determines the temperature of a luminous surface from the spectrum of the thermal radiation it emits, a process known as pyrometry.

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