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Question: 10<sup>20</sup> photons of wavelength 660 nm are emitted per second from a lamp. What is the wattage...

1020 photons of wavelength 660 nm are emitted per second from a lamp. What is the wattage of lamp?

A

30 W

B

60 W

C

100 W

D

500 W

Answer

30 W

Explanation

Solution

p = nhcλ\frac{nhc}{\lambda}