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The energy (in eV) of each photon associ...

The energy (in eV) of each photon associated with the light of wavelength `5893 Å`

A

`2.1`

B

`3.9`

C

`4.2`

D

`5.89`

Text Solution

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The correct Answer is:
A
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A 100W sodium lamp radiates energy uniformly in all directions. The lamp is located at the centre of a large sphere that absorbs all the sodium light which is incident on it. The wavelength of the sodium light is 589 nm. (a) What is the energy per photon associated with the sodium light? (b) At what rate are the photons delivered to the sphere?

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Knowledge Check

  • Statement I: The energy of the associated photon becomes half when the wavelength of the electromagnetic wave is doubled. Statement II: Momentum of a photon = ("energy of the photon")/("velocity of light")

    A
    Statement I is true, statement II is true, statement II is a correct explanation for statement I
    B
    Statement I is true, statement II is true, statement II is not a correct explanation for statement I
    C
    statement I is true, statement II is false
    D
    statement I is false, statement II is true

  • The work function of a metal surface is 2.0 eV. Light of wavelength 5000 Å is incident on it:

    A
    the energy of each incident photon is 2.48 eV
    B
    the threshold wavelength for photoelectric effect is `6200 Å`
    C
    maximum kinetic energy of emitted photoelectron is 0.48 eV
    D
    stopping potential is 0.48 eV

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    When light of wavelength 4041 Å falls on a metal surface, the maximum velocity of the emitted photoelectrons becomes twice the maximum velocity when another light of wavelength 5893 Å falls on the same surface. What is the photoelectric work function of that metal?

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