Explanation Given info: The total amount of energy in the form of light is 10 − 18 J and frequency of the light is 5 × 10 14 Hz . Formula to calculate the energy of the light by using Planck’s quantum theory is, E = h f Here, E is the energy of the light. h is the Planck’s constant. f is the frequency of the light. Substitute 5 × 10 14 Hz for f and 6.63 × 10 − 34 J ⋅ s for h to find E . E = ( 6.63 × 10 − 34 J ⋅ s ) ( 5 × 10 14 Hz ) = 33.15 × 10 − 20 J = 3

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Question

Chapter 9, Problem 13E

To determine

The number of photons in the light energy can be detected by the eye.

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Chapter 9, Problem 12E

Chapter 9, Problem 14E

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