Explanation Given info: The duration of pulse is 20 ms , the power of laser is 0.50 W and the wavelength of laser is 643 nm . Write an expression to calculate the energy per pulse E = P t Here, E is the energy per pulse P is the power of laser t is the time Substitute 0.50 W for P and 20 ms for t to find E . E = ( 0.50 W ) ( ( 20 ms ) ( 1 s 10 3 ms ) ) = 0.01 J/pulse Write an expression to calculate the energy per photon. E ' = h c λ Here, E ' is the energy per photon h is the planks constant c is the speed of light λ is the wavelength Substitute 6.626 × 10 34 m 2 kg/s for h , 3.00 × 10 8 m/s for c and 643 nm for λ to find E ' . E ' = ( 6.626 × 10 34 m 2 kg/s ) ( 3

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Author: KRAUSKOPF, Konrad B. (konrad Bates), Beiser, Arthur

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Question

Chapter 9, Problem 17E

To determine

The number of photons in each pulse.

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Chapter 9, Problem 16E

Chapter 9, Problem 18E

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Chapter 9 Solutions

Physical Universe

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