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82. A 200W so...

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82. A 200W sodium Street lamp emits yellow light of wavelength 0.6 micrometer . Assuming it to be 25% efficient in converting electrical energy to light , the number of photons of yellow light it emits per second is

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Q. A 200W sodium street lamp emits yellow light of wavelength

0.6 μ m

. Assuming it to be 25% efficient converting electrical energy to light, the number of photons of yellow light it emits per second is :

Q. Calculate the number of photons emitted per second by a 10 W sodium vapour lamp. Assume that 60% of the consumed energy is converted into light. Wavelength of sodium light = 590 nm

Q. A sodium lamp of power

10

W is emitting photons of wavelength

590

nm. Assuming that

60 %

of the consumed energy is converted into light, find the number of photons emitted per second by the lamp.

Q. What will be the number of photons emitted per second by a

10 w a t t

sodium vapour lamp assuming that

90 %

of the consumed energy is converted into light? Wavelength of sodium light is

590 n m; h = 6.63 \times 10^{- 34} J s

Q. Calculate the number of photons emitted by

100 W

1 s

. If the wavelength of yellow light is

560 nm

100 %

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