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A 100 W sodium lamp radiates energy uni...

A 100 W 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.
What is the energy per photon associated with the sodium light ?

A

2.11

B

1.22

C

0.5

D

3.21

Text Solution

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The correct Answer is:
A
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A 100W sodium lamp radiates energyuniformly 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 ?

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 589nm. (a) What is energy associated per photon with the sodium light? (b) At what rate are photons delivered to the sphere?

Knowledge Check

  • If mean wavelength of light radiated by 100 W lamp is 5000 Å , then number of photons radiated per second are

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    `3 xx 10^(23)`
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    `2.5 xx 10^(22)`
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    D
    `5 xx 10^(17)`

  • Sodium lamp emits yellow light of wavelength 5800 Å the wave number of the light is

    A
    `1.72xx10^(6)//m`
    B
    `17.2xx10^(8)//m`
    C
    `5.17xx10^(14)//s`
    D
    `17.2xx10^(7)//m`

  • A 160 watt infrared source is radiating light of wavelength 50000Å uniformly in all directions. The photon flux at a distance of 1.18 m is of the order of -

    A
    `10 m^(-2)s^(-1)`
    B
    `10^(10)m^(-2)s^(-1)`
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