"A 193-nm-wavelength UV laser for eye surgery emits..." was answered by our experts

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katelineliseua

Answered question

2021-11-06

A 193-nm-wavelength UV laser for eye surgery emits a 0.500 mJ pulse. How many photons does the light pulse contain?

Answer & Explanation

Beulah Bryan

Beginner2021-11-07Added 4 answers

The engry of a single photon of a given wavelength is

E = \frac{h c}{λ}

so we can write

E = \frac{6.63 \times 10^{- 34} \times 3 \times 10^{8}}{193 \times 10^{- 9}}

E = 1 \times 10^{- 18} J

Now, the number of photons in the pulse is

N = \frac{E_{p \underset{―}{s} e}}{E_{p h}}

so write

N = \frac{5 \times 10^{- 4} J}{1 \times 10^{- 18} J}

N = 5 \times 10^{14}

Result:

N = 5 \times 10^{14}

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