(a) Determine the power of radiation from the Sun by noting that the intensity of the radiation at the distance of Earth is 1370 W/m2 . Hint: That intensity will be found everywhere on a spherical surface with radius equal to that of Earth’s orbit. (b) Assuming that the Sun’s temperature is 5780 K and that its emissivity is 1, find its radius.

(a) Determine the power of radiation from the Sun by noting that the intensity of the radiation at the distance of Earth is 1370 W/m2 . Hint: That intensity will be found everywhere on a spherical surface with radius equal to that of Earth’s orbit. (b) Assuming that the Sun’s temperature is 5780 K and that its emissivity is 1, find its radius.

University Physics Volume 2

18th Edition

ISBN:9781938168161

Author:OpenStax

Publisher:OpenStax

Chapter1: Temperature And Heat

Section: Chapter Questions

Problem 122AP: (a) Deter-nine the power of radiation from the Sun by noting that the intensity of the radiation at...

See similar textbooks

Similar questions

Two very long concentric cylinders of diameters D1 = 0.35 m and D2 = 0.5 m are maintained at uniform temperatures of T1 = 950 K and T2 = 500 K and have emissivities «1 = 1 and «2 = 0.55, respectively. Determine the net rate of radiation heat transfer between the two cylinders per unit length of the cylinders.
Two very large parallel plates are maintained at uniform temperatures of T1 = 600 K and T2 = 400 K and have emissivities «1 = 0.5 and «2 = 0.9, respectively. Determine the net rate of radiation heat transfer between the two surfaces per unit area of the plates.
If the absolute temperature of a spherical object were tripled, by what factor would the rate of radiated energy emitted from its surface be changed?
A spherical surface of area 0.6m2, emissivity 0.86 and temperature 112°C is placed in a large, evacuated chamber whose walls are maintained at fixed temperature. Find the rate at which radiation is emitted by the surface? ( Stefan's constant σ = 5.67 x 10-8 W/m2T4 ) Energy radiated per second in watts = (b) A wire of 5.25 cm, carrying current passes between the poles of a strong magnet that is perpendicular to its field and experiences a 2.28N force due to the field of strength 3.1. What is the current through the wire? the current through the…
Consider a 10-ft * 10-ft * 10-ft cubical furnace whose top and side surfaces closely approximate black surfaces and whose base surface has an emissivity « = 0.7. The base, top, and side surfaces of the furnace are maintained at uniform temperatures of 800 R, 1600 R, and 2400 R, respectively. Determine the net rate of radiation heat transfer between (a) the base and the side surfaces and (b) the base and the top surfaces. Also, determine the net rate of radiation heat transfer to the base surface.
A water heater is operated by solar power. If solar collector has an area of 6.00m2 , and the Intensity delivered by sunlight is 550W/m2 , how long does it take to increase the temperature of 1m3 of water from 20°Cto 60°C?
What is the intensity of the radiation emitted by a hot skyscraper in Dubai (350 K) relative to that emitted by the Sacred Valley in Cusco at night (250 K)?
The tungsten filament of an incandescent light bulb has a temperature of approximately 3000 K. The emissivity of tungsten is approximately 1/3, and you may assume that it is independent of wavelength. If the bulb gives off a total of 100 watts, what is the surface area of its filament in square millimeters?
The radius of our Sun is 6.96 × 108 m, and its total power output is 3.85 × 1026 W. (a) Assuming the Sun’s surface emits as a black body, calculate its surface temperature. (b) Using the result of part (a), find λmax for the Sun
The amount of radiant power produced by the sun is approximately 3.9 × 1026 W. Assuming the sun to be a perfect blackbody sphere with a radius of 6.96 × 108 m, find its surface temperature (in kelvins).
Consider a surface at a uniform temperature of 800 K. Determine the maximum rate of thermal radiation that can be emitted by this surface, in W/m2.
Two long parallel 20-cm-diameter cylinders are located 30 cm apart from each other. Both cylinders are black, and are maintained at temperatures 425 K and 275 K. The surroundings can be treated as a blackbody at 300 K. For a 1-mlong section of the cylinders, determine the rates of radiation heat transfer between the cylinders and between the hot cylinder and the surroundings.