An incandescent light bulb has a tungsten filament that is heated to a temperature of 3.20 × 103 K when an electric current passes through it. If the surface area of the filament is approximately 1.00 × 10−4 m2 and it has an emissivity of 0.360, what is the power radiated by the bulb?The Stefan–Boltzmann constant (σ) is 5.670 × 10−8 W/(m2·K4).

An incandescent light bulb has a tungsten filament that is heated to a temperature of 3.20 × 103 K when an electric current passes through it. If the surface area of the filament is approximately 1.00 × 10−4 m2 and it has an emissivity of 0.360, what is the power radiated by the bulb?The Stefan–Boltzmann constant (σ) is 5.670 × 10−8 W/(m2·K4).

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter11: Energy In Thermal Processes

Section: Chapter Questions

Problem 58AP: The surface area of an unclothed person is 1.50 m2, and his skin temperature is 33.0C. The person is...

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An incandescent light bulb has a tungsten filament that is heated to a temperature of 3.20 × 103 K when an electric current passes through it. If the surface area of the filament is approximately 1.00 × 10−4 m2 and it has an emissivity of 0.360, what is the power radiated by the bulb?The Stefan–Boltzmann constant (σ) is 5.670 × 10−8 W/(m2·K4).
An incandescent light bulb has a tungsten filament that is heated to a temperature of 3.00 x103 K when an electric current passes through it. If the surface area of the filament is approximately 1.00 x 10-4 m? and it has an emissivity of 0.370, what is the power radiated by the bulb?The Stefan-Boltzmann constant (0) is 5.670 x 10-8 W/(m 2. k4). Thank u!
(b) A spherical surface of area 0.7m2, emissivity 0.88 and temperature 120°C is placed in a large, evacuated chamber whose walls are maintained at a fixed temperature. Find the rate at which radiation is emitted by the surface?( Stefan's constant o = 5.67 x 10-8 W/m²Tª ) Energy radiated per second in watts =
A plane brick wall (k = 0.7 W/m⋅K) is 10 cm thick. The thermal resistance of this wall per unit of wall area is a. 0.524 m2⋅K/W b. 0.250 m2⋅K/W c. 0.327 m2⋅K/W d. 0.143 m2⋅K/W e. 0.448 m2⋅K/W
The tungsten filament of a light bulb has an operating temperature of about 2100 K.If the emitting area of the filament is 1 cm2, and its emissivity (ε) is 0.68, what is the power output of the light bulb?
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A student in a lecture hall has 0.320 m2 of skin (arms, hands, and head) exposed. The skin is at 34.0°C and has an emissivity of 0.970. The temperature of the room is 29.5°C (air, walls, ceiling, and floor all at the same temperature). The Stefan–Boltzmann constant is 5.670 × 10−8 W/ (m2. K4 ). A) At what rate does the skin emit thermal radiation? in W B) At what rate does the skin absorb thermal radiation? in W C) At what rate does the skin absorb thermal radiation? in W D) Compare this to the total rate of heat flow from the body, which is about 100 W.______ % of total rate
A person is standing outdoors in the shade where the temperature is 21 °C. (a) What is the radiant energy absorbed per second by his head when it is covered with hair? The surface area of the hair (assumed to be flat) is 130 cm2 and its emissivity is 0.90. (b) What would be the radiant energy absorbed per second by the same person if he were bald and the emissivity of his head were 0.54?
Please help! A student in a lecture hall has 0.310 m^2 of skin (arms, hands, and head) exposed. The skin is at 34.0°C and has an emissivity of 0.970. The temperature of the room is 20.2°C (air, walls, ceiling, and floor all at the same temperature). The Stefan-Boltzmann constant is 5.670 x 10-8 w/ (m2. k4 ). a) at what rate does the skin emit thermal radiation? b) at what rate does the skin absorb thermal radiation? THANK U
What is the rate of heat transfer by radiation, with an unclothed person standing in a dark room whose ambient temperature is 22.0C. The person has a normal skin temperature of 33.0C and a surface area of 1.50 m2. The emissivity of skin is 0.97 in the infrared, where the radiation takes place.
On a multi-layered square wall, the thermal resistance of the first layer is 0.005 ° C / W, the resistance of the second layer is 0.2 ° C / W, and the third layer is 0.1 ° C / W. The overall temperature gradient in the wall is multilayered from one side. to the other side is 60 ° C. a. Determine the heat flux through the walls. = Answer watts / m2. b. If the thermal resistance of the second layer is changed to 0.3 ° C / W, what is the effect in% on heat flux, assuming the temperature gradient remains the same? = Answer Answer %.
The tungsten filament of a light bulb has an operating temperature of about 2100 K. If the emitting area of the filament is 1.0 cm2, and its emissivity is 0.68, what is the power output of the light bulb? (s = 5.67×10-8 W/m2×K4) A. 100 W B. 75 W C. 60 W D. None of the above