Question: A laser emits 1.0 10 19 photons per second from an excited state with energy E 2 = 1.17 eV. The lower energy level

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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