UNDERSTANDING THE UNIVERSE(LL)-W/CODE
3rd Edition
ISBN: 9780393869903
Author: PALEN
Publisher: NORTON
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Chapter 11.2, Problem 11.2CYU
To determine
The different processes through which the energy travel from core to outer surface in Sun.
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The Sun has a radius of about 700,000 km and a surface temperature of 5800 K. Assuming it is a perfect blackbody (an emissivity of 1), what is the rate of energy radiated (in W) from the surface of the Sun? (Hint: the surface area of a sphere is 4πR2; enter your answer in scientific notation, 1.23E12 means 1.23 * 1012).
How much radiant energy is emitted by one square meter of an object (a) at 77K
(b) 300K and (c) 2000K?
1
Using the provided equation of radiative energy transport, find an estimate for the central temperature of the sun. (Hint: the average opacity of the sun is κ⨀ = 8 m2 kg-1)
Chapter 11 Solutions
UNDERSTANDING THE UNIVERSE(LL)-W/CODE
Ch. 11.1 - Prob. 11.1CYUCh. 11.2 - Prob. 11.2CYUCh. 11.3 - Prob. 11.3CYUCh. 11.4 - Prob. 11.4CYUCh. 11 - Prob. 1QAPCh. 11 - Prob. 2QAPCh. 11 - Prob. 3QAPCh. 11 - Prob. 4QAPCh. 11 - Prob. 5QAPCh. 11 - Prob. 6QAP
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- Give proper explanation The surface temperature of the Sun is about 5750 K. What is this temperature on the Fahrenheit scale?arrow_forward(W/m), in Santa solar radiation into energy- solar radiation (w/m?) 400 300 200 100 time (hrs past midnight) 4 8 12 16 20 ot dengndi loarrow_forwardThe best solar panels currently available are about 19% efficient in converting sunlight to electricity. A typical home will use about 40. kWh of electricity per day (1 kWh=1 kilowatt hour; 1kW=1000J/s). Assuming 8.1 hours of useful sunlight per day, calculate the minimum solar panel surface area necessary to provide all of a typical home’s electricity. The energy rate supplied by the sun is 1.0kJ/s times meters squared . Area = meters squaredarrow_forward
- The radiant flux at Earth is 1365 W/m2. Say we move towards the sun to a radius that is 1/3 the radius of the Earth's orbit. By what factor would the radiant flux increase or decrease?arrow_forwardHomework 6 Problem 3: The core of the Sun has a temperature of 1.5 × 107 K, while the surface of the Sun has a temperature of 5320 K (which varies over the surface, with the sunspots being cooler). Treat the core of the Sun and the surface of the Sun as two large reservoirs connected by the solar interior. Nuclear fusion processes in the core produce 3.8 × 1026 J every second. Assume that 100% of this energy is transferred from the core to the surface. Part (a) Calculate the change in the entropy ΔS, in joules per kelvin, of the Sun every second. ΔSS = ______ Part (b) Rigel is a blue giant star with a core temperature of 5.0 x 107 K and a surface temperature of 10400 K. If the core of Rigel produces 60,000 times as much energy per second as the core of the Sun does, calculate the change in the entropy ΔSR, in joules per kelvin, of Rigel every second. ΔSR = ______ Part (c) Barnard’s Star is a red dwarf star with a core temperature of 7.0 x 106 K and a surface temperature of 3820 K.…arrow_forwardGive explanation also..arrow_forward
- The average temperature of the atmosphere has increased by 0.4°C over the last thirty years. Estimate how much energy has gone into warming up the planet in this way. Keep in mind that the atmosphere has a mass of 5 × 1018kg, and the specific heat capacity of air is about 1 Jg−1K−1. How do we get to this answer (2×1021J)arrow_forwardTwo stars, A and B, have the same emissivity, but the radii and surface temperatures are different with RA = 0.5RB, and TA = 2TB. Assuming the temperature of space to be negligible, which star radiates the most energy per unit time? a. Star Ab. Star Bc. Both radiate the same amount of energy per unit time.d. More information is needed in order to make a determination.arrow_forwardWhat is external forced convection? How does it differ from internal forced convection? Can a heat transfer system involve both internal and external convection at the same time? Give an example.arrow_forward
- You heat up a piece of hot metal with an emissivity of 0.1 until it glows. If the temperature of the metal is 3000 K, and the surface area of the metal is 0.1 meters squared, how much heat energy per second is transferred by radiation from the metal? 0.000001701 Joules per second (or Watts) 30 Joules per second (or Watts) 459270 Joules per second (or Watts) 45927 Joules per second (or Watts) 810000000000 Joules per second (or Watts)arrow_forwardBy definition, 10,000 K is the upper limit of the Kelvin temperature scale? True O Falsearrow_forwardCan you answer the question?arrow_forward
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