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A 100 W sodium lamp radiates energy unif...

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. The number of photons delivered per second to the sphere is

A

`3xx10^(20)` Photons/Sec

B

`5xx10^(20)` Photons/Sec

C

`7xx10^(20)` Photons/Sec

D

`9xx10^(20)` Photons/Sec

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 center 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?

A 100 watt bult emits monochromatic light of wavelength 400 nm. Calcualte the number of photons emitted per second by the bulb.

Knowledge Check

  • A 100W sodium lamp radiates energy uniformly in all directions. The lamp is located at the center 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?

    A
    `3xx10^(15)`
    B
    `3xx10^(10)`
    C
    `3xx10^(20)`
    D
    `3xx10^(19)`

  • A 100 watt bulb emits monochromatic light of wavelength 400 nm. Calculate the number of photons emitted per second by the bulb.

    A
    `3xx10^(20)s^(-1)`
    B
    `2xx10^(-20)s^(-1)`
    C
    `2xx10^(20)s^(-1)`
    D
    `1xx10^(-20)s^(-1)`

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