Question: A light source emits a monochromatic light (only one frequency is emitted) that has a wavelength of 750 nm (7.5 x 10-7 m) during 2

A light source emits a monochromatic light (only one frequency is emitted) that has a wavelength of 750 nm (7.5 x 10-7 m) during 2 hours and 8 minutes. If 2.55 x 1010 photons are emitted per second. How much energy (in Joule) is emitted during this period?

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