Explanation 1) Concept: According to quantum mechanics , light beam consists of photons, and each photon carries a specific amount of energy, depending upon the wavelength of light . So we can find out the total energy of light beam by knowing the energy of photons and the number of photons present in the beam. 2) Formula: i) Energy of photon ϵ = h c λ ii) Power P = E t = e n e r g y t i m e iii) Number of photons N = t o t a l e n e r g y o f l i g h t b e a m ϵ 3) Given: i) Efficiency of bulb, 93 % ii) Wavelength of light, λ = 630 n m iii) Life time of bulb, t = 730 h iv) Power delivered by bulb, P = 60 W 4) Calculations: We know that power is the ratio of energy to time: Therefore, P = e n e r g y t i m e = E t So the total energy emitted by the bulb will be E = P t Since, efficiency of the bulb is 93 % , we can write it as 93 100 = 0.93 So the power delivered by the bulb is 0.93 × P = 0.93 × 60 = 55.8 W E = P t = 55

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Chapter 38, Problem 13P

To determine

To find:

Number of photons emitted

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Chapter 38, Problem 12P

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Chapter 38 Solutions

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