10. A laser produces 20.0 mW atts of red light. In 30.0 minutes, the laser emits \( 1.15 \times 10^{20} \) photons. What is the laser's wavelength?
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\[ 20.0 \, \text{mW} = 20.0 \times 10^{-3} \, \text{W} = 0.020 \, \text{W} \] Show more…
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