Question 1 True or False:
Cold objects such as a bottle of beer just taken from the refrigerator do not radiate any thermal energy at all because there temperature is near zero Celsius. True
False Question 2 Which would radiate more thermal energy at the same temperature: A shiny new dime or a dirty copper penny? The dirty penny
They would both radiate the same amount
The shiny new dime Question 3
A 100 Watt light bulb is energized with 120 volts. Determine the current flowing through the filament. 1.200 Amperes
1.000 Amperes
0.500 Amperes
0.75 Amperes
0.833 Amperes Question 4
Interpolation: If the R/R300 value is 11.33, what temperature would the tungsten filament of a light bulb be? You will
have to read and understand the lab procedure to answer this question. 2245 degrees Kelvin
2230 degrees Kelvin
2215 degrees Kelvin
2200 degrees Kelvin
2255 degrees Kelvin
2207 degrees Kelvin
2205 degrees Kelvin Question 5 When a heat lamp is connected to the 120 volt line it draws a current of 3 Amperes. Determine the resistance of the filament at this lamp. 40 Ohms
60 Ohms
20 Ohms
30 Ohms
10 Ohms Question 6
If a 100 Watt light bulb filament has an emissivity of 0.5 and a surface area of approximately 1.8 x 10^­4 meter^2, determine the operating temperature in degrees Kelvin 1925 Kelvin
1875 Kelvin
2100 Kelvin
1950 Kelvin
2050 Kelvin Question 7 A large incandescent light bulb used in a spotlight in the 1939 movie "The Wizard of Oz" had an operating temperature of 2500 degrees Kelvin. If the surface area of the filament was 1 x 10^­2 meters^2, and the material used had an emissivity of 0.7, determine the electrical power used to run the light in Joules/second (Watts). approximately 20 kiloWatts
approximately 10 kiloWatts
approximately 15 kiloWatts
approximately 150 kiloWatts
approximately 12.5 kiloWatts Question 8
The star Antares is a red super­giant star in the Milky Way Galaxy and the sixteenth brightest star in the nighttime sky. It is so big that if it were placed in the center of our solar system, its outer surface would lie between the orbits of Mars and Jupiter.
Its outer surface temperature has a temperature of 3400 Kelvin and a radius 883 times larger than our own Sun. Assuming an emissivity of 1, determine the thermal energy released by this huge star in Watts. 7.03 x 10^75 Watts
4.86 x 10^47 Watts
3.6 x 10^31 Watts
2.27 x 10^26 Watts
6.7 x 10^22 Watts Question 9 The Old Burning Barrel:
Sidney and Serina are adding wood to the old 55 gallon drum shown on page 148 in our textbook. Sidney: "The temperature of the barrel is 1000 Kelvin"
Serina: "I bet I can raise that higher by adding more wood, here see, it is getting hotter" Sidney: "Yes, I can feel that the heat output has doubled since you added that last log"
Assuming the above parameters are correct, what is the new temperature of the burning barrel? 2000 Kelvin
1500 Kelvin
1750 Kelvin
1094 Kelvin
1250 Kelvin
1189 Kelvin Question 10
In a government program designed to help Pakistan's insurgents, a strange test is being carried out at the Johnson Metal Foundry in Bethesda, MD. Here, CIA scientists subjected a long metal plate measuring 1 meter by 100 meters is to a temperature profile in such a way that the temperature linearly increases from 0 degrees Kelvin at the left end to 1000 degrees Kelvin at the right end. If we assume the emissivity is 1, determine the total thermal energy in Watts being emitted by this piece of metal. Use your EXCEL skills in this one. About 110 Megawatt
About 22 Megawatts
About 55 Megawatts
About 5.5 Megawatts
About 11 Megawatts
About 1.1 Megawatt

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