# Question

Assume that a 100-W light bulb gives off of its energy as visible light. How many photons of visible light are given off in 1.00 min? (Use an average visible wavelength of 550 nm.)

## Answer to relevant Questions

A metal with a work function of 2.40 eV is illuminated by a beam of monochromatic light. If the stopping potential is 2.50 V, what is the wavelength of the light? When light of wavelength of 250 nm is incident on a metal surface, the maximum speed of the photoelectrons is 4.0 x 105 m/s. What is the work function of the metal in eV? What are the wavelength and frequency of the most intense radiation component from a blackbody with a temperature of 0oC? Find the energy of a hydrogen atom whose electron is in the (a) n = 2 state and (b) n = 3 state. (a) For which of the following transitions in a hydrogen atom is the photon of longest wavelength emitted: (1) n = 5 to n = 3, (2) n = 6 to n = 5, or (3) n = 2 to n = 1? (b) Justify your answer mathematically.Post your question

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