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Light year is a unit of...

Light year is a unit of

A

Time

B

Mass

C

Distance

D

Luminous intensity

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Knowledge Check

  • In burglar alarm, infrared beam of light is used instead of visible light, because

    A
    work function of infrared ligth is low.
    B
    infrared lamps are cheap.
    C
    infrared beam can be concealed from the burglar.
    D
    frequency of infrared light is higher than frequency of visible light.
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