Conceptual Physics Chapter 16

A liter of hot water will cool to room temperature faster in a A) black pot. B) silver pot. C) red pot. D) depends more on the size of the pot than its color

A) black pot.

Objects that radiate relatively well A) absorb radiation relatively well. B) reflect radiation relatively well. C) both of these D) neither of these

A) absorb radiation relatively well.

f you were caught in freezing weather with only a candle for heat, you would be warmer in A) an igloo. B) a tent. C) a wooden house. D) a car.

A) an igloo.

Cold water will warm to room temperature faster in a A) black pot. B) silver pot. C) depends more on the size of the pots than their color

A) black pot.

Which body glows with electromagnetic waves? A) both the Sun and the Earth B) only the Sun C) only the Earth D) neither the Sun or the Earth

A) both the Sun and the Earth

If air were a better conductor than it is, at nighttime the Earth would be A) considerably colder. B) considerably warmer. C) not appreciably different in temperature

A) considerably colder.

Warm air rises because faster-moving molecules tend to move to regions of less A) density and less pressure. B) pressure. C) density.

A) density and less pressure.

Suppose you want to save energy and you're going to leave your warm house for a half hour on a cold day. You should turn the thermostat A) down. B) up. C) to room temperature.

A) down.

The technology for orbiting solar power plants A) awaits the next century. B) already exists. C) is theoretically impossible.

B) already exists.

When a volume of air is compressed, its temperature A) increases. B) decreases. C) neither increases nor decreases.

B) decreases.

The reason the sun's radiant energy is of shorter wavelengths than the Earth's is because the sun A) has much more internal energy. B) has a higher temperature than the Earth. C) is an energy source while the Earth is primarily an energy receiver. D) all of these E) none of these

B) has a higher temperature than the Earth.

The pupil of your eye is A) a net absorber of radiant energy. B) a net emitter of radiant energy. C) neither a net absorber nor emitter of radiant energy.

A) a net absorber of radiant energy.

A Thermos bottle has double glass walls with silver coating on the glass surfaces that face one another. The silver coating reduces the energy that is transferred by A) conduction. B) convection. C) radiation. D) friction. E) none of these

C) radiation.

A good heat conductor is A) a poor insulator. B) a good insulator. C) neither a poor nor a good insulator.

A) a poor insulator.

A good absorber of radiation is a A) good emitter of radiation. B) poor emitter of radiation. C) good reflector. D) none of these

A) good emitter of radiation.

An object will normally be a net radiator of energy when its temperature is A) higher than its surroundings. B) lower than its surroundings. C) neither of these

A) higher than its surroundings.

In a mixture of hydrogen gas, oxygen gas, and nitrogen gas, the molecules with the greatest average speed are those of A) hydrogen. B) oxygen. C) nitrogen. D) All will have the same average speed at the same temperature.

A) hydrogen.

Double the absolute temperature of helium gas and the average speed of its molecules A) less than doubles. B) doubles. C) more than doubles.

A) less than doubles.

If a poor absorber of radiation were a good emitter, its temperature would be A) less than its surroundings. B) more than its surroundings. C) the same as its surroundings.

A) less than its surroundings.

An object will normally be a net radiator of energy when its internal energy is A) more than that of its surroundings. B) less than that of its surroundings. C) neither of these, because internal energy is not temperature

A) more than that of its surroundings.

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 A) right away. B) at any time. C) when you are ready to drink the coffee.

A) right away.

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 A) supports this common knowledge. B) shows this common knowledge is false. C) supports or contradicts this common knowledge.

A) 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 A) the black surface. B) the white surface. C) Neither - there is no difference.

A) the black surface.

Waves emitted by the sun and terrestrial wave emissions are A) the same except for their frequencies and wavelengths. B) entirely different kinds of waves. C) identical.

A) the same except for their frequencies and wavelengths.

At the same temperature, which move with the greater speed in the air? A) very light molecules B) heavier molecules C) All will have equal average speeds.

A) very light molecules

If a volume of air is warmed, it expands. If a volume of air expands, it A) warms. B) cools. C) neither warms nor cools.

A) warms.

Your feet feel warmer on a rug than on a tile floor because a rug A) is usually warmer than tile. B) is a better insulator than tile. C) for the same mass has more internal energy than tile. D) all of these E) none of these

B) is a better insulator than tile.

Metals are both good heat conductors and good electrical conductors because of the A) similarity between thermal and electrical conductive properties. B) looseness of outer electrons in metal atoms. C) relatively high densities of metals. D) high elasticity of metals. E) ability of metals to transfer energy easily.

B) 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 A) low temperature of the coals. B) low thermal conductivity of the coals. C) mind over matter techniques

B) low thermal conductivity of the coals.

The higher the temperature of an object A) the longer the wavelengths it radiates. B) the shorter the wavelengths it radiates. C) makes no difference in the wavelengths it radiates

B) the shorter the wavelengths it radiates.

Both black and white road surfaces radiate energy. At the end of a starry night the warmer road surface will be A) the black surface. B) the white surface. C) Neither - there is no difference.

B) the white surface.

Newton's law of cooling applies to objects that are A) cooling. B) heating. C) both of these D) none of these

C) both of these

If a solid object radiates more energy than it absorbs, its A) internal energy and temperature decrease. B) temperature decreases. C) internal energy decreases. D) None of the above choices are true

C) internal energy decreases.

Suppose you want to save energy and you're going to leave your cool house for a half hour on a hot day. You should turn the temperature setting on the air conditioner A) down a little. B) up a little. C) off altogether. D) to room temperature.

C) off altogether.

A good reflector of radiation is a A) good absorber of radiation. B) good emitter of radiation. C) poor absorber of radiation. D) none of these

C) poor absorber of radiation.

The planet Earth loses heat mainly by A) conduction. B) convection. C) radiation. D) all of these

C) radiation.

If molecules in a gas sample moved so they completely missed each other, the gas's temperature would A) increase. B) decrease. C) stay the same

C) stay the same

Substances absorb heat energy by the process of A) conduction. B) convection. C) radiation. D) all of these

D) all of these

Energy transfer by convection is primarily restricted to A) solids. B) liquids. C) gases. D) fluids. E) none of these

D) fluids.

Hydrogen and oxygen molecules in a gas sample have the same temperature. This means the hydrogen molecules, on the average, have the same A) speed and the same kinetic energy. B) speed, but more kinetic energy. C) speed, but less kinetic energy. D) kinetic energy, but more speed. E) kinetic energy, but less speed.

D) kinetic energy, but more speed.

A water-filled paper cup held in a flame will not catch fire. This is because A) the inside of the paper is wet. B) water is an excellent conductor of heat. C) paper is a poor conductor of heat. D) the paper cup cannot become appreciably hotter than the water it contains.

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