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Solved: A typical red laser pointer has a power of 5 mW.

Chapter 7, Problem 157P

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QUESTION:

A typical red laser pointer has a power of 5 mW. How long would it take a red laser pointer to emit the same number of photons emitted by a 1-W blue laser in 1 s? (1 W = 1 J/s.)

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QUESTION:

A typical red laser pointer has a power of 5 mW. How long would it take a red laser pointer to emit the same number of photons emitted by a 1-W blue laser in 1 s? (1 W = 1 J/s.)

ANSWER:

Step 1 of 3

A typical red laser pointer has a power of 5 mW. We need to find how long it would take a red laser pointer to emit the same number of photons emitted by a 1-W blue laser in 1 s.

Since it is a blue light, let us assume that it has a  wavelength. The energy can be solved by



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