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Is the colour of 620 nm light and 780 nm...

Is the colour of 620 nm light and 780 nm light same? Is the colour of 620 nm light and 621 nm light same? How many colours are there in white light?

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Knowledge Check

  • The colour of the emitted light on an LED depends on …………

    A
    the material
    B
    applied voltage
    C
    the geometry of the circuit
    D
    the type of biasing

  • The colour of light emitted by LED depends on :

    A
    its forward bias
    B
    its reverse bias
    C
    type of semiconductor material used
    D
    the amount of forward current

  • The energy of light of wavelength 45 nm is

    A
    `6.67 xx 10^(15)J`
    B
    `6.67 xx 10^(11)J`
    C
    `4.42 xx 10^(-18)J`
    D
    `4.42 xx 10^(-15)J`

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