Physics Chapter 16

Réussis tes devoirs et examens dès maintenant avec Quizwiz!

Which will undergo the greater rate of cooling - a red-hot poker in a warm oven or a red-hot poker in a cold room (or do both cool at the same rate)?

red-hot poker in a cold room

Suppose you are served coffee at a restaurant before you are ready to drink it. In order for it to be the hottest when you are ready for it, you should add cream

right away.

Which body glows with electromagnetic waves?

both the Suns and the Earth

If air were a better conductor than it is, at nighttime the Earth would be

considerably colder.

Newton's law of cooling applies to objects that undergo _______.

cooling or warming

When air rapidly expands, its temperature normally _______.

decreases.

Thermal convection applies mainly to _______.

fluids.

When your foot stands on a tile floor, thermal energy always flows _______.

from either your foot or the tile depending on the temperature of the tile.

A good absorber of radiation is a

good emitter or radiation.

The reason the sun's radiant energy is of shorter wavelengths than the Earth's is because the sun

has a higher temperature than the Earth.

The relation ƒ ~ T tells us that high-temperature sources emit electromagnetic waves of _______.

high frequency

In a mixture of hydrogen gas, oxygen gas, and nitrogen gas, the molecules with the greatest average speed are those of

hydrogen.

When a volume of air is compressed, its temperature

increases.

Your feet feel warmer on a rug than on a tile floor because a rug

is a better insulator than tile.

Hydrogen and oxygen molecules in a gas sample have the same temperature. This means the hydrogen molecules, on the average, have the same

kinetic energy, but more speed.

If a poor absorber of radiation were a good emitter, its temperature would be

less than its surroundings.

Metals are both good heat conductors and good electrical conductors because of the

looseness of outer electrons in metal atoms.

One of the main reasons one can walk barefoot on red-hot coals of wood without burning the feet has to do with

low thermal conductivity of the coals.

A good reflector of radiation is a

poor absorber of radiation.

Heat travels from the Sun to the Earth by the process of _______.

radiation.

The planet Earth loses heat mainly by

radiation.

Cold water will warm to room temperature faster in a

black pot.

A liter of hot water will cool to room temperature faster in a

black pot.

Relatively speaking, do high-frequency waves have long wavelengths or short wavelengths?

short wavelengths

It is commonly thought that a can of beverage will cool faster in the coldest part of a refrigerator. Knowledge of Newton's law of cooling

supports this common knowledge.

Both black and white road surfaces absorb sunlight. At the end of a sunny day the warmer road surface will be

the black surface.

A water-filled paper cup held in a flame will not catch fire. This is because

the paper cup cannot become appreciably hotter than the water it contains.

The higher the temperature of an object

the shorter the wavelengths it radiates.

At the same temperature, which move with the greater speed in the air?

very light molecules


Ensembles d'études connexes

Chapter 45: Tissue Integrity/ Integumentary Disorder

View Set

POS 2001: Chapter 11 Authoritarianism and Democratization

View Set

PSY 274 Inquizitive Week 11: Stereotypes, Prejudice, Discrimination

View Set

Property and Casualty Insurance Basics

View Set

Technology Support Chapter 5 Study Guide

View Set

Chapter 11: Public Speaking Preparation

View Set

Intro to business. How to form a business

View Set