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PREVIOUS ANSWERS WAUNIPHYSAV1 32.P.025. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER What is the intensity of an electromagnetic wave with a peak electric field strength of 251 V/m? X What is the relationship between intensity and the maximum electric eld strength in a wave? W/m2 1. {0/1 Points] Submit Answer ASK YOUR TEACHER PRACTICE ANOTHER 2. [-/1 Points] WAUNIPHYSAV1 32.P.028. A 2.40-m diameter university communications satellite dish receives TV signals that have a maximum electric field strength (for one channel) of 7.49 uV/m. (a) What is the intensity of this wave? E W (b) What is the power received by the dish? E W (c) If the orbiting satellite broadcasts uniformly over an area of 1.50 x 1013 m2 (a large fraction of North America), how much power does it radiate? :W ASK YOUR TEACHER PRACTICE ANOTHER WAUNIPHYSAV1 32.P.030. 3. [-/1 Points] On its highest power setting, a 620-watt microwave oven heats a bowl of spaghetti' (a) Find the intensity of the microwaves, given they are absorbed over a circular area 20 cm in diameter. C] W (b) What is the peak electric field strength of the microwave? V/m (c) What is its peak magnetic field strength? :lT WAUNIPHYSAV1 32.P.033.TUTORIAL. ASK YOUR TEACHER Solar radiation intensity averages to be 1366 W/mZ at the top of the Earth's atmosphere. What is the solar radiation intensity at the top of Mars's atmosphere? (The orbital radius of Earth is 1.49597887 x 1011 meters, and 4. [/1 Points] the orbital radius of Mars is 2.27936637 x 1011 meters.) W/m2 What is the electric eld strength on Mars due to solar radiation? V/ m Q Tmorlal WAUNIPHYSAV1 32.P.034. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER (a) You direct a 14.5 mW laser beam toward a surface at normal incidence. The surface is made of a material that completely absorbs the radiation What is the radiation pressure on the surface if the cross section of the beam has a diameter of 2.65 mm when it arrives at the surface? SW (b) You now direct the same laser beam, with the same power and beam cross section, at normal incidence on a mirror where 100% of the beam is reected from the surface. What is the total pressure on it due to the incident and reflected energies? SW 5. [-/1 Points] 6. [-/1 Points] WAUNIPHYSAV1 32.P.036.TUTORIAL. ASK YOUR TEACHER PRACTICE ANOTHER A 15.0 mW laser beam is directed toward a small sphere of diameter 1256 nm and density 7.00 x 103 kg/m3. The beam's focusing is adjusted until the cross section of the beam is the same as the sphere's diameter: If the sphere absorbs 100% of the incident energy, calculate the magnitude of the acceleration of the sphere due to the radiation force it experiences from the beam. :1 m/s2 @Tutorlal PREVIOUS ANSWERS WAUNIPHYSAV1 32.P.037. ASK YOUR TEACHER PRACTICE ANOTHER You direct a 15.0 mW laser beam toward a reflecting surface at normal incidence. The cross section of the beam has a diameter of 1.85 mm when it arrives at the surface. If 89% of the beam is reected from the surface, what is the total pressure on it due to the incident and reected energies? Ex How is the pressure related to the intensity of the incident beam? By what factor will the pressure change when 89% of the beam is reflected? N/m2 7. [0/1 Points] 8. [0/1 Points] PREVIOUS ANSWERS WAUNIPHYSAV1 32.P.038. ASK YOUR TEACHER PRACTICE ANOTHER A perfectly reecting surface of area 38.0 cm2 experiences a momentum transfer per second of magnitude 1.65 x 10'10 N when a plane electromagnetic wave strikes it. Determine the intensity of the wave. x How is the change in momentum related to the intensity of the incident wave? Note that this surface is a perfectly reflective surface. W/m2