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Calculate the number of photons emitted ...

Calculate the number of photons emitted per second by a 10 watt sodium vapor lamp. Assume that 90% of the consumed energy is converted into light. Wavelength of sodium light is 590nm. `h=6.62xx10^(-34)Js`

A

(a)`1.67 xx 10^(18)`

B

(b)`1.67 xx 10^(20)`

C

(c)`2.67 xx 10^(19)`

D

(d)`3.67 xx 10^(23)`

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