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OpenStudy (anonymous):
A laser produces 20.0 mW of red light. In 1.00 hr, the laser emits 2.57×1020 photons. What is the wavelength of the laser?
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OpenStudy (ookawaiioo):
0.020 Watts * 3600sec = Energy Energy = h*f = h*(c/wavelength) Wavelength = h*c/Energy h = planck constant (I forgot what the values were) c = speed of light (3.0 x 10^8 m/s) Goodluck
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