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Number of Photos, Wavelength, Maximum Energy and Velocity

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1. A candle flame can be seen at night at a distance of 2 km by the unaided eye. If it emits visible light at the rate of 0.02 J/s, what is the number of photons that enter the eye per second?

2. What is the wavelength of a beam of ultraviolet light if its photon energy is 10 eV? If the beam produces photoelectrons from iron, which has a work function of 4.72 eV, what is the maximum energy and the maximum velocity of the electrons?

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Solution Summary

This solution provide calculations for finding the number of photons, wavelength, maximum energy, and maximum velocity.

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1. Number of photons that enter the eye per second = 2000/0.02 = 10^4 per ...

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