Explanation Given Info: The wavelength of the ultraviolet photons absorbed by phosphor is 185 nm and the wavelength of photons emitted by phosphor is 655 nm . Formula to calculate the energy of the ultraviolet photons is, E = h c λ Here, E is the energy of the ultraviolet photons. h is the Planck’s constant. c is the velocity of light. λ is wavelength of the ultraviolet photons. Substitute 185 nm for λ to find E . E = h c λ = h c 185 nm Formula to calculate the energy of photons emitted by phosphor is, E ' = n h c λ ' Here, λ ' is the wavelength of photons emitted by phosphor

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Chapter 31, Problem 67PCE

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The maximum number of red 655 -nm photons emitted by phosphor.

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Chapter 31, Problem 66PCE

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Physics, Books a la Carte Plus Mastering Physics with Pearson eText -- Access Card Package (5th Edition)

Ch. 31.1 - Prob. 1EYU Ch. 31.2 - Prob. 2EYU Ch. 31.3 - Prob. 3EYU Ch. 31.4 - Prob. 4EYU Ch. 31.5 - Prob. 5EYU Ch. 31.6 - Prob. 6EYU Ch. 31.7 - Prob. 7EYU Ch. 31 - Prob. 1CQ Ch. 31 - Prob. 2CQ Ch. 31 - Prob. 3CQ

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