(1a). Figure shows a copper rod AB being heated at one end. Explain how the heat transfers from A to B. What is the name of this method? (2r copper rod B Bunsen burner (1b). The Earth can be considered to be a perfect black body radiator at a temperature of 110°F. Radius of Earth is 6350 km. Calculate the total power radiated from the Earth in Watts (W)

(1a). Figure shows a copper rod AB being heated at one end. Explain how the heat transfers from A to B. What is the name of this method? (2r copper rod B Bunsen burner (1b). The Earth can be considered to be a perfect black body radiator at a temperature of 110°F. Radius of Earth is 6350 km. Calculate the total power radiated from the Earth in Watts (W)

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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What is the maximum wavelength emitted by a blackbody whose temperature is 2900 K
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(1a). Figure shows a copper rod AB being heated at one end. Explain how the heat transfers from A to B. What is the name of this method? copper rod Bunsen burner (1b). The Earth can be considered to be a perfect black body radiator at a temperature of 134°F. Radius of Earth is 6390 km. Calculate the total power radiated from the Earth in Watts (W)
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).
5. Calculate the total power radiated per unit area by a tungsten filament at a temperature of 3000. K. (Assume that the filament is an ideal radiator.) (b) If the tungsten filament of a lightbulb is rated at 75.0 W, what is the surface area of the filament? (Assume that the main energy loss is due to radiation.)
Consider an insulated container containing 2.1-kg ice at -11°C. Inside the container, there is a spherical object with radius 31 cm and at a certain temperature of 12160°C. Calculate the time (in hours) where all the ice has melter. Assume that sphere is a black body. NOTE: Use pi = 3.14 Final answer in TWO decimal place. No need to type the unit. c_water = 4190 J/kgK, c_ice = 2100 J/kgK, Lf = 334,000 J/kg, o = 5.6704e(-8) W/m²K4.
2. a) At what wavelength is the peak in the thermal ("blackbody") spectrum of the Sun? What about for the Earth? Make sure you show how you got these numbers, and then b) Give a term for the part of the electromagnetic spectrum in which these peaks occur (e.g., x-ray, UV, Visible, IR, microwave, etc.). c) What is the total flux emitted in each case (in W m ²)?
A wire of length 7,6 m and radius 2,5 mm is heated by the electric current to the temperature 1019"C. treating the wire as a perfect blackbody and ignoring any end effects, calculate the radiant power of the wire in kW. Ответ:
1. When the sun is directly overhead, the thermal energy incident upon the earth is about 1.4 × 106 ergs- cm-2-sec-¹. The diameter of the sun is about 1.6 × 10¹¹cm, and the distance from the sun to the earth is about 1.3 × 10¹3 cm. Assuming the that the sun radiates like a black body, use the expression I = σeT4 to estimate its surface temperature. 2. Integrate the expression 8πhc² 1 15 exphc/kXT –1 over all λ, and show that the temperature dependence of the result is T4. I(x) dx -dλ
Not only is liquid nitrogen a cheaper coolant than liquid helium, its boiling point is higher (77 K vs. 4.2 K). How does higher temperature help lower the cost of cooling a material? Explain in terms of the rate of heat transfer being related to the temperature difference between the sample and its surroundings.
The figure below is an open ended cylindrical radiation shields. What is the total emissivity of the shield?
The Earth reradiates the energy it receives from the Sun as a black body. We can calculate the effective temperature of the Earth using the Stefan-Boltzmann equation F = sT4 where we solve for the Temperature T. We use for the energy flux the amount of energy absorbed per second Le divided by the Earth's surface area from which the energy is radiated 4pd2 so that the flux is = Le/(4pd2). Here d is the radius of the Earth given above and s is the Stefan-Boltzmann constant. And the effective temperature is:Te4 = (Le/(4pd2))/s = Le/(4spd2) = __________________ K4and taking the square root of Te4 twice in succession we get the effective Temperature Te:Te = [Le/(4spd2)]0.25 = _________________ Kfor the temperature of the effective Earth. What is the temperature in the Celsius scale? __________ C. (Do I need to tell you how to convert from Kelvin to Celsius? If you don't know look it up in your textbook!!)