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).
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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
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- A cylindrical surface of radius 57 cm and length 1.2 m maintained at a temperature of 142°C is continuously emitting radiations. If the emissivity of the surface is 0.83. (consider: Stefan's constant σ = 5.67 x 10-8 W/m2T4) Calculate the rate of heat energy radiated in Watts = AnswerConsider liquid water at 1 atm. At 25◦C, the density of water is 0.997044 g cm−3 . The coefficient of thermal expansion, α, is well fitted by α = e + ft + gt2 where t is in celsius and e = −1.00871 × 10-5 K−1 , f = 1.20561 × 10-5 C −1 K−1 , and g = −5.4150 ×10-8 C−2 K−1 . What is the density of the water at 38◦CA 19 century lab technician is testing possible metals for bulb filaments. A tantalum filament with a surface area of 0.370 mm and an emissivity of 0.976 radiates 0.80 W of light. Determine the filament's temperature (in K). The melting point for tantalum is 3269 K.
- blacksmith is flattening a steel plate having dimensions 10 cm×15 cm×1 mm. He has heated the plate to 950 K. If the emissivity of the plate is 0.75, (a) at what rate does it lose energy by radiation and (b) how much energy will it radiate into the surrounds in 45 minutes? (σ = 5.67 × 10−8 W/m2/K4).Liquid helium is stored at its boiling-point temperature of 4.2 K in a spherical container (r = 0.30 m). The container is a perfect blackbody radiator. The container is surrounded by a spherical shield whose temperature is 91 K. A vacuum exists in the space between the container and the shield. The latent heat of vaporization for helium is 2.1 × 104 J/kg. What mass of liquid helium boils away through a venting valve in one hour?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).
- Thank you! Required info: 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) what is the net rate of heat flow from the body due to thermal radiation? b) compare this to the total rate of heat flow from the body, which is about 100 W.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 USirius B is a white star that has a surface temperature (in kelvins) that is four times that of our sun. Sirius B radiates only 0.040 times the power radiated by the sun. Our sun has a radius of 6.96 × 108 m. Assuming that Sirius B has the same emissivity as the sun, find the radius of Sirius B. RSB= O
- Presents the diagram of the problem, necessary formulas, clearance and numerical solution: The filament of an incandescent lamp has an area of 50 mm2 and operates at a temperature of 2,127 ◦C. Assume that all the energy supplied to the bulb is radiated by it. If the emissivity of the filament is 0.83, how much power must be supplied to the bulb when it is in operation?The next four questions use this description. Our Sun has a peak emission wavelength of about 500 nm and a radius of about 700,000 km. Your dark-adapted eye has a pupil diameter of about 7 mm and can detect light intensity down to about 1.5 x 10-11 W/m2. Assume the emissivity of the Sun is equal to 1. First, given these numbers, what is the surface temperature of the Sun in Kelvin to 3 significant digits? What is the power output of the Sun in moles of watts? (in other words, take the number of watts and divide it by Avogadro's number) Assuming that all of the Sun's power is given off as 500 nm photons*, how many photons are given off by the Sun every second? Report your answer to the nearest power of 10 (e.g. if you got 7 x 1024, give your answer as 25).Problem 4: A student foolishly attempts to stop a steel bar, of length L = 1 m and at a temperature of 20ºC, from thermally expanding by attaching it to a wooden support with a nail at each end. Steel's Young's modulus is Y = 1.9 × 1011 N/m2 and it's linear thermal expansion coefficient is α = 12.3 × 10-61/C. Randomized VariablesY = 1.9 × 1011 N/m2α = 12.3 × 10-6 1/C I just need part C Part (a) Enter an expression, in terms of defined variables, for the stress, S, that each nail will need to sustain at a temperature Ts. S = Y α ( Ts - To ) Part (b) What is the value of the stress, in pascals, that develops due to a rise of temperature to 21ºC? S = 2337000 Part (c) Assuming the nails have a cross-sectional area of A = 10-5 m2 all of which is perpendicular to the stress force from the bar, what is the force acting on each due to that temperature rise?