6 The intensity of solar radiation measured from the Earth is 1370 W m². The Earth is 1.5 x 10¹1 m from the Sun. Calculate: a the output power of the Sun b the intensity of the solar radiation at the surface of Mercury, which is 5.7 x 10¹0 m from the Sun.
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- Satellite TV is broadcast from satellites that orbit the earth. Their antennas broadcast a 15 kW microwave signal that covers most of North America, an area of about 2.5 × 107 km2. What is the total power that strikes a 46-cm-diameter ground-based dish antenna?The state-of-the-art digital air surveillance radar used in civil aviation emits its signal equally in all directions (isotropically) with an average power of 22.0 kW. What is the average intensity near an aircraft on final approach to an airport, 7.76 km from the radar tower? W/m2What is the wavelength of light if its frequency is 1.4 x 104 Hz? Assume the light is traveling through a vacuum.
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- You and your friend Bruce are experimenting with a red lamp shade and blue lamp shade. You place lamp shades individually over a 120-W light bulb. Assume that the light radiates from the lamps uniformly and 7.8% of their power is converted to light. (a) What is the average intensity of the light at 2.0 m from the red (? = 710 nm) lamp shade? ___________________ W/m2The intensity of electromagnetic energy from the Sun reaching the Earth is 1,390 W/m?. Earth is about 1.5 x 1011 m from the Sun and Saturn is about 10 times further, how much power would a 1.00 m2 solar panel receive at the distance of Saturn? Provide the solution:Radiation from the sun reaching the earth has an intensity of 1.4 kW/m^2. a) What is the total power radiated by the sun? (The sun is 1.5 x 10^11 m from earth.) b) Assuming all the incident energy is absorbed, what is the force on the earth due to radiation pressure?
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