chp38_16 - in the light coming from the sun? ( answer:...

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PHY2061 R. D. Field Department of Physics chp38_16.doc University of Florida The Radiation Power of the Sun Problem: The radiation power of the sun is 3.9x10 26 W and the distance from the Earth to the sun is 1.5x10 11 m . (a) What is the intensity of the electromagnetic radiation from the sun at the surface of the Earth (outside the atmosphere)? ( answer: 1.4 kW/m 2 ) (b) What is the maximum value of the electric field in the light coming from the sun? ( answer: 1,020 V/m ) (c) What is the maximum energy density of the electric field in the light coming from the sun? ( answer: 4.6x10 -6 J/m 3 ) (d) What is the maximum value of the magnetic field in the light coming from the sun? ( answer: 3.4 µ T ) (e) What is the maximum energy density of the magnetic field
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Unformatted text preview: in the light coming from the sun? ( answer: 4.6x10-6 J/m 3 ) (f) Assuming complete absorption what is the radiation pressure on the Earth from the light coming from the sun? ( answer: 4.7x10-6 N/m 2 ) (g) Assuming complete absorption what is the radiation force on the Earth from the light coming from the sun? The radius of the Earth is about 6.4x10 6 m . ( answer: 6x10 8 N ) (h) What is the gravitational force on the Earth due to the sun? The mass of the Earth and the sun are 5.98x10 24 kg and 1.99x10 30 kg , respectively, and G = 6.67x10-11 Nm 2 /kg 2 . ( answer: 3.5x10 22 N ) P = 3.9 x 10 26 W d = 1.5 x 10 11 m Sun Earth...
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