Phys_322_HW3 - Physics 322 HW3 Solution 1. N P P 100 550...

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Physics 322 HW3 Solution 1. 9 20 1 34 8 100 550 10 2.8 10 6.63 10 3 10 N P P s t h hc   2. Radiation pressure / F p t P A A ; incident momentum E p c . So 2 E p c   , so 2 2 2 E F E I c t P A A t A c c   If it’s not normal incident, only normal component of the momentum changes, 2 cos E p c   , so 2 cos I P c 3. 15 0 cos 10 0.65 z x E E t c (a) 15 14 10 5 10 2 f Hz   (b) 15 2 10 0.65 c , so 7 3.9 10 m (c) 8 14 7 3 10 1.5 5 10 3.9 10 c n f 4.   1 2 2 2 2 0 0 1 e e Nq n m For low density gases,   2 2 2 0 0 1 e e Nq m  For 1 x  , 1 1 1 2 x x   So   2 2 2 0 0 1 2 e e Nq n m  
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This note was uploaded on 12/07/2011 for the course PHYS 322 taught by Professor Na during the Fall '11 term at Purdue University-West Lafayette.

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Phys_322_HW3 - Physics 322 HW3 Solution 1. N P P 100 550...

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