A laser emits 1.0 10 19 photons per second from an excited state with energy E
Question:
A laser emits 1.0 × 1019 photons per second from an excited state with energy E2 = 1.17 eV. The lower energy level is E1 = 0 eV.
a. What is the wavelength of this laser?
b. What is the power output of this laser?
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Related Book For 
Physics For Scientists And Engineers A Strategic Approach With Modern Physics
ISBN: 9780321740908
3rd Edition
Authors: Randall D. Knight
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