Explanation 1) Concept: We use the photon energy formula. Substituting the frequency in energy of photon, we get the new formula of energy in terms of wavelength. Substituting all values, we can solve for the photon energy of the light. 2) Formula: i) E = h f ii) f = c λ 3) Given: 1 m = 1650763.73 λ of orange light. 4) Calculations: For a light of frequency f and wavelength λ , the energy E of the photon is E = h f where h is Planck constant and f is the frequency. The wavelength λ is related to frequency f as f = c λ E = h c λ h = 6.626 × 10 - 34 J . s , c = 2.998 × 10 8 m / s We know that 1 e V = 1.602 × 10 - 19 J 1 = 1.602 × 10 - 19 J e V h c = 6

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Question

Chapter 38, Problem 5P

To determine

To find:

the photon energy of the orange light, that was once used for defining a standard meter length.

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Chapter 38, Problem 4P

Chapter 38, Problem 6P

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The meter was once defined as 1 650 763.73 wavelengths of the orange light emitted by a source containing krypton-86 atoms. What is the photon energy of that light?

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Chapter 38 Solutions

Fundamentals of Physics Extended

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