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11_pdfsam_Phy63S10-Q1-4-Solutions

11_pdfsam_Phy63S10-Q1-4-Solutions - Phy63 Spring 2010(DiZth...

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Unformatted text preview: Phy63 Spring 2010 (DiZth k=21tl7t = E = Emaxcos(kx — mt) E/B = c c = 3x108 m/s 5 z (E x‘B)/tto I = $an = Emax max/(2144,) I x 41 o cosz(¢/2) q) = 21: d sine/7L d sine = 111). d sine = (m + 1/91 —— 22.; .\,x?,_ 21:5 €173.32 JG 3m (133,8? «’1? 4.12 1. Rays of sunlight parallel to the x-axis and of spatially uniform intensity shine from the left to right; Two identical, cone-shaped objects, each with its side at 450 angle with respect to the base are placed with the tip toward the sunlight (pointing to the left). One cone surface absorbs the light completely, while the other reflects the light completely. The two objects experience the same radiation force (1 point): 2. A "sun" of radius 1 km shines uniformly in all directions. A planet, 106 km away, detects an intensity of 0.751: kW/mAZ (while directly facing this sun). At the surface of this sun, the maximum amplitude of the magnetic field is approximately (2 points): I °< '67:,“ ":> ICr: SILT-Pa.“ «C Sun): 0.75m'i0‘7, kg M a. 'RT 7— “L I 1.4 T - gamma 3.“)? M F f' . 3M3 3. I s = “5% c._ 10’3n'r ' _‘ ' 9WD _ '01-le40 d. 1_4x'10_3fl 3m: 0.15mi newly” 2 Mi 7 ‘ 3.9/8 . e. 0.047 7': T .. _ . .. Bel?“ ”(WW5 ll 1‘: ...
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