1126_Physics ProblemsTechnical Physics

1126_Physics ProblemsTechnical Physics - Chapter 40 P40.10...

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Chapter 40 467 P40.10 We take θ = 00300 . radians. Then the pendulum’s total energy is Em g hm g LL E == =− = × cos .. . . . a f bg ej 1 00 9 80 1 00 0 999 5 4 41 10 3 kg m s J 2 The frequency of oscillation is f g L = ω ππ 2 1 2 0498 . H z . The energy is quantized, En h f = . Therefore, n E hf × ×⋅ −− 441 10 134 10 3 1 31 . . . J 6.626 10 J s s 34 e j FIG. P40.10 P40.11 The radiation wavelength of ′ = λ 500 nm that is observed by observers on Earth is not the true wavelength, , emitted by the star because of the Doppler effect. The true wavelength is related to the observed wavelength using: cc vc = + λλ 1 1 : = + = + = 1 1 500 10 2 8 0 2 8 0 375 af nm nm . . . The temperature of the star is given by max . T 2898 10 3 mK : T = 3 . max : T = × 375 10 773 10 3 9 3 . . K. P40.12 Planck’s radiation law is IT hc e hc k T π , = 2 1 2 5 B . Using the series expansion ex xx x =++ + + 1 23 !! . Planck’s law reduces to hc hc k T hc hc k T ck T , bg bg = ++
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This note was uploaded on 12/14/2011 for the course PHY 203 taught by Professor Staff during the Fall '11 term at Indiana State University .

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