1135_Physics ProblemsTechnical Physics

1135_Physics ProblemsTechnical Physics - 476 *P40.32...

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476 Introduction to Quantum Physics *P40.32 The photon energy is E hc == ×⋅ × × λ 663 10 633 10 314 10 34 9 19 . . Js3 10 ms m J 8 ej . The power carried by the beam is 2 10 3 14 10 0 628 18 19 ×× = photons s J photon W e j . . . Its intensity is the average Poynting vector IS r = × av 2 W4 m Wm P π 2 3 2 5 0628 175 10 261 10 . . . af . (a) SE B EB av rms rms = 1 90 1 22 00 µµ sin max max . Also c max max = . So S E c av = max 2 0 2 µ . Ec S B max max . . . . × × × = × × 4 1 0 3 1 0 2 6 1 1 0 140 10 31 0 468 10 0 12 78 5 4 4 8 5 µπ av 2 Tm A m s W m NC ms T bg e j e j (b) Each photon carries momentum E c . The beam transports momentum at the rate c . It imparts momentum to a perfectly reflecting surface at the rate 2 20628 0 419 10 8 9 c × force W N . . . (c) The block of ice absorbs energy mL t = melting m t L × × 333 10 102 10 5 2 . . . W 1.5 3 600 s Jkg kg . Section 40.5 The Wave Properties of Particles
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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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