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Chapter 18: Problem 9

Which of the following does not radiate heat? a) ice cube b) liquid nitrogen c) liquid helium d) a device at \(T=0.010 \mathrm{~K}\) e) all of the above f) none of the above

Short Answer

Expert verified
a) Ice Cube b) Liquid Nitrogen c) Liquid Helium d) Device at T = 0.010 K e) All of the Above f) None of the Above Answer: None of the options meet the criterion of not radiating heat, as they are all at temperatures above absolute zero.

Step by step solution

01

Option a: Ice Cube

Ice cubes are at a temperature of around 273 K (0°C), and since they are above absolute zero, they will emit thermal radiation according to the Stefan-Boltzmann law. Therefore, they do radiate heat.
02

Option b: Liquid Nitrogen

Liquid nitrogen has a boiling point of 77 K and is a cooling agent. It is also above absolute zero, which means it radiates heat, albeit at a relatively low rate compared to high-temperature objects.
03

Option c: Liquid Helium

Liquid helium has a boiling point of about 4.2 K. Even though this is extremely close to absolute zero, it is still above it, so it does emit thermal radiation, although at a very low rate.
04

Option d: Device at T = 0.010 K

The device with a temperature of 0.010 K is extremely close to absolute zero, but not quite there, so it still radiates a small amount of thermal radiation.
05

Option e: All of the Above

Since options a through d do radiate heat, option e is incorrect.
06

Option f: None of the Above

Option f would be correct if none of the given options were true. However, since Options a, b, c, and d do radiate heat, this option is also incorrect. To summarize, all of the options given radiate heat to some extent because they are at temperatures above absolute zero. As a result, none of the options meet the criterion of not radiating heat.

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Most popular questions from this chapter

Why does tile feel so much colder to your feet after a bath than a bath rug? Why is this effect more striking when your feet are cold?

A 2.0 -kg metal object with a temperature of \(90^{\circ} \mathrm{C}\) is submerged in \(1.0 \mathrm{~kg}\) of water at \(20^{\circ} \mathrm{C}\). The water-metal system reaches equilibrium at \(32^{\circ} \mathrm{C}\). What is the specific heat of the metal? a) \(0.840 \mathrm{~kJ} / \mathrm{kg} \mathrm{K}\) b) \(0.129 \mathrm{~kJ} / \mathrm{kg} \mathrm{K}\) c) \(0.512 \mathrm{~kJ} / \mathrm{kg} \mathrm{K}\) b) \(0.129 \mathrm{~kJ} / \mathrm{kg} \mathrm{K}\) d) \(0.433 \mathrm{~kJ} / \mathrm{kg} \mathrm{K}\)

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A gas enclosed in a cylinder by means of a piston that can move without friction is warmed, and 1000 J of heat enters the gas. Assuming that the volume of the gas is constant, the change in the internal energy of the gas is a) 0 . b) 1000 J. c) -1000 J. d) none of the above.

A thermal window consists of two panes of glass separated by an air gap. Each pane of glass is \(3.00 \mathrm{~mm}\) thick, and the air gap is \(1.00 \mathrm{~cm}\) thick. Window glass has a thermal conductivity of \(1.00 \mathrm{~W} /(\mathrm{m} \mathrm{K})\), and air has a thermal conductivity of \(0.0260 \mathrm{~W} /(\mathrm{m} \mathrm{K})\). Suppose a thermal window separates a room at temperature \(20.00{ }^{\circ} \mathrm{C}\) from the outside at \(0.00^{\circ} \mathrm{C}\). a) What is the temperature at each of the four air-glass interfaces? b) At what rate is heat lost from the room, per square meter of window? c) Suppose the window had no air gap but consisted of a single layer of glass \(6.00 \mathrm{~mm}\) thick. What would the rate of heat loss per square meter be then, under the same temperature conditions? d) Heat conduction through the thermal window could be reduced essentially to zero by evacuating the space between the glass panes. Why is this not done?
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