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Physics question

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1.Making estimates. The human eye can detect as few as 9760 photons per second entering the pupil. About how much energy is this, per second? (Assume the photons have a wavelength of 300 nm.)

2.How many visible photons would be needed to have enough energy to lift a 0.6 newton weight through 0.2 meter? (Assume a visible photon has a frequency of 5 ✕ 1014 Hz.)
asked Aug 17, 2017 in Physics by molly

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