Explanation Given data: Wavelength is 630 nm. Power is 5 mW. Formula used: Consider the energy equation. E = h c λ (1) Here, h is the planks constant, which has a standard value as 6.63 × 10 − 34 J ⋅ s , c is the speed of light, which has a standard value as 3 × 10 8 m s , and λ is the wavelength. Current equation I = Q t (2) Here, Q is the charge, and t is the time. Consider the power equation. p = N × E t (3) Here, N is the number of charges, and t is the time period. Explanation: We know that, Q = N × e Here, N is the number of charges, and e is the charge of electron, with a standard value as 1.6 × 10 − 19 C . Substitute N × e for Q in equation (2), I = N × e t (4) Substitute E from equation (1) in equation (3), p = N × ( h c λ ) t p = N × h c t λ N t = p λ h c Substitute 6.63 × 10 − 34 J ⋅ s for h , 3 × 10 8 m s for c , 630 nm for λ , 5 mW for power, N t = 5 mW × 630 nm ( 6

3rd Edition

ISBN: 9780134201948

Author: Knight, Randall Dewey, Jones, Brian, Field, Stuart

Publisher: Pearson,

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Chapter 28, Problem 61GP

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The current required to produce 5 mW of light.

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Chapter 28, Problem 60GP

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The current required to produce 5 mW of light.

Solution Summary: The author calculates the current required to produce 5 mW of light, based on the energy equation.

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The current required to produce 5 mW of light.

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Chapter 28 Solutions