This preview shows pages 1–2. Sign up to view the full content.
This preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
Unformatted text preview: Physics 208, Spring 08, Week 12 Quizzes 1. Multiple choice 1. The Earth is about 1.49 x 10 8 km from the Sun. If the solar radiation at the top of the Earth’s atmosphere has an intensity of 1340 W/m 2 , what is the total power output of the Sun? a. 7.10 x 10 27 W b. 2.20 x 10 30 W c. 6.62 x 10 26 W d. 3.74 x 10 26 W [Hint: assume isotropic radiation emission from the Sun in order to calculate the area of a sphere at a distance equal to the EarthSun distance.] Solution d) I = P/A Assuming isotropical emission A = 4 π R 2 P = IA, with R distance Earth – Sun. 2. If the radiant energy from the Sun comes in as a plane EM wave of intensity 1340 W/m 2 , calculate the peak values of E and B. a. 300 V/m, 104 T b. 1005 V/m, 3.35 x 106 T c. 225 V/m, 1.6 x 103 T d. 111 V/m, 3 x 105 T Remember that ε = 8.85 x 1012 C 2 / (N m 2 ). You can then derive μ if you do not remember it… Solution: b E max = 1005 V/m B max = 3.35e6 T 3. Find the force exerted by reflecting sunlight off a perfectly reflecting 3....
View
Full
Document
This note was uploaded on 04/29/2008 for the course PHYS 208 taught by Professor Rzchowski during the Spring '08 term at University of Wisconsin.
 Spring '08
 Rzchowski
 Physics, Power, Radiation

Click to edit the document details