Loose Leaf For Explorations: Introduction To Astronomy
9th Edition
ISBN: 9781260432145
Author: Thomas T Arny, Stephen E Schneider Professor
Publisher: McGraw-Hill Education
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Chapter 4, Problem 6P
To determine
The temperature of the stove.
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(1a). Black body has emissivity value of 1, but in
reality, the emissivity of real objects is less than
1. Why?? (1.5 marks)
(1b). The tungsten sphere of 250 mm radius is
at a temperature of 31°C . If the power radiated
by sphere is 107 W, calculate its emissivity
value?
(2marks)
(1c).lf the same sphere is enclosed in room
whose walls are kept at -11°C, what is the net
flow rate of energy out of the sphere in Watts
(W)
Explain what happens at
High temperature T>>θE and
Low temperature T<
(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
B
Bunsen
burner
(1b). The Earth can be considered to be a perfect black body radiator at a temperature of 112 F. Radius of
Earth is 6390 km. Calculate the total power radiated from the Earth in Watts (W)
Chapter 4 Solutions
Loose Leaf For Explorations: Introduction To Astronomy
Ch. 4 - Prob. 1QFRCh. 4 - Prob. 2QFRCh. 4 - Prob. 3QFRCh. 4 - Prob. 4QFRCh. 4 - Prob. 5QFRCh. 4 - Describe the Kelvin temperature scale.Ch. 4 - Prob. 7QFRCh. 4 - Prob. 8QFRCh. 4 - Prob. 9QFRCh. 4 - Prob. 10QFR
Ch. 4 - Prob. 11QFRCh. 4 - Prob. 12QFRCh. 4 - Prob. 1TQCh. 4 - Prob. 2TQCh. 4 - Prob. 3TQCh. 4 - Prob. 4TQCh. 4 - (4.3/4.4/4.5) Given that water absorbs microwaves...Ch. 4 - Prob. 6TQCh. 4 - Prob. 7TQCh. 4 - Prob. 8TQCh. 4 - Prob. 9TQCh. 4 - Prob. 10TQCh. 4 - (4.1) Use the Suns distance of 150 million...Ch. 4 - (4.1) Suppose you are operating a...Ch. 4 - Prob. 3PCh. 4 - Prob. 4PCh. 4 - Prob. 5PCh. 4 - Prob. 6PCh. 4 - Prob. 7PCh. 4 - Prob. 8PCh. 4 - (4. 6) Calculate the Doppler shift for blue light...Ch. 4 - Prob. 10PCh. 4 - (4.2) Which kind of light travels fastest? (a)...Ch. 4 - Prob. 2TYCh. 4 - Prob. 3TYCh. 4 - Prob. 4TYCh. 4 - Prob. 5TYCh. 4 - Prob. 6TYCh. 4 - Prob. 7TYCh. 4 - Prob. 8TYCh. 4 - What is Galilean relativity? Give an example of...Ch. 4 - Prob. 2EQFRCh. 4 - Prob. 3EQFRCh. 4 - Prob. 4EQFRCh. 4 - What is meant by panspermia?Ch. 4 - Prob. 6EQFRCh. 4 - Prob. 7EQFRCh. 4 - Prob. 1ETQCh. 4 - Prob. 2ETQCh. 4 - Prob. 3ETQCh. 4 - Prob. 1EPCh. 4 - Mercury orbits the Sun at speeds ranging from 59...Ch. 4 - Prob. 3EPCh. 4 - Prob. 1ETYCh. 4 - The Miller-Urey experiment demonstrated that (a)...Ch. 4 - Prob. 3ETYCh. 4 - Prob. 4ETYCh. 4 - Prob. 5ETY
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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 A 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 6380 km. Calculate the total power radiated from the Earth in Watts (W)arrow_forwardGiven this equation for converting temperature from Celsius (c) to Fahrenheit (f) is C = [5(f – 32)]/9, what is the Celsius temp when Fahrenheit is 104 degrees?arrow_forward(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 B A Bunsen burner (1b). The Earth can be considered to be a perfect black body radiator at a temperature of 130°F. Radius of Earth is 6360 km. Calculate the total power radiated from the Earth in Watts (W)arrow_forward
- At "low" temperatures, the heat capacity of some materials varies with temperature as 3 12π¹ NkB T C (T) ² (£) ². 5 Here N is the number of atoms, kB is Boltzmann's constant, and Tp is the "Debye temperature," which is different for different materials. For example, 2300 K for diamond, which is particularly high. TD = How much energy would it take to raise the temperature of one mole of diamond from 100 K to 300K? O 150 Joules. 60 Joules. O 319 joules. O 630 Joules.arrow_forwardCompare the rates of emission of heat by perfectly black body at 427°C and 127°C.arrow_forwardA hollow box with an opening of 1 cm2 area is heated electrically. How much is energy is emitted per second if the temperature is 1600K? [answer is 37.2 x 104 J/m2s]arrow_forward
- Mercury thermometers cannot measure temperatures below -30◦C because at that temperature Hg becomes pasty. Could you indicate to what temperature Fahrenheit and Kelvin it corresponds? Text Digital Pleasearrow_forwardMercury thermometers cannot measure temperatures below -30◦C because at that temperature Hg becomes pasty. Could you indicate to what temperature Fahrenheit and Kelvin it corresponds?arrow_forwardHow much heat (in joules) is required to raise the temperature of 24.4 kg of water from 19 ∘C to 88 ∘C? Express your answer using two significant figures.arrow_forward
- If it is -2•F outside and the temperature will drop 10•F in the next five hours , how cold will it get .arrow_forward3. (3.a) The table given below is shown C/R ratios of some solids at 273 K. Here, R is the ideal gas constant and C is the heat capacity of solid. What is the reason that C/R value is very far away from 3 for diamond? Explain and discuss this question in the light of relevant theory/theories on heat capacity. Material C/R Copper (Cu) Gold (Au) Silver (Ag) Diamond (C) 2.94 3.05 2.99 0.74 (3.b) According to Debye Theory of heat capacity of solids heat capacity, C, depends on T' (temperature in Kelvin) and this law is given as below. 3 12 n*R C = Here Op is called as Debye temperature. The following Table as given below contains some experimental data of heat capacity as a function of temperature for potassium iodide (KI) material. 3.b.1. Why is Debye temperature important for materials? And when is Debye T³ law important for solids? 3.b.2. Make an estimation by calculation of Debye Temperature of KI material according to given values in Table shown below? T(K) C (JK.mol) 0.1 2.94 1.0…arrow_forwardA spherical blackbody of 5 cm in radius is in equilibrium with its surroundings. It then absorbs 50 Kw of power radiated to it from the surroundings. What is the approximate temperature of the sphere?arrow_forward
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