PHY1020C Test 3

The planet Earth loses heat mainly by

radiation

If you heat an ice bucket of water for several hours until only a small amount of ice remains, the temperature of water will be

0 degrees Celsius

How many joules does it take to vaporize 1 gram of water?

2255J

Near the top of a mountain, water in an open pot boils at

a lower temperature than at sea level

A standing wave occurs when

a source wave and its reflected wave in phase

Warm air rises because faster-moving molecules tend to move to regions of less

density and less pressure

When you touch a cold piece of ice with your finger, energy flows

from your finger to the ice.

Steam burns are more damaging than burns caused by boiling water because steam

gives up change of phase energy when it condenses. has more energy per kilogram than boiling water. Choices A and B are both correct.

As atmospheric pressure is increased, the boiling temperature of a liquid

goes up

Which of the following expands most when the temperature is increased? Equal volumes of

helium

The moderate temperatures of islands throughout the world has much to do with water's

high specific heat

Food in a pressure cooker is cooked faster because of the

high temperatures reach in a sealed container

A sound source of high frequency has high

pitch

Which of the follow is not a transverse wave?

sound

Wave interference occurs for

sound waves, light waves, and water waves (all of the above are correct)

The explanation for refraction must involve a change in

speed

Sound travels fastest in

steel

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

the black surface.

The frequency of a simple pendulum depends on

two of these (length and mass)

The food in a refrigerator is cooled by

vaporization of the refrigerating fluid.

If you add heat for 35 minutes to a pan with 2 kgs of 100°C water in it the temperature of the remaining water will be

100 degrees Celsius

An object that completes 20 vibrations in 10 seconds has a frequency of

2 hertz

The approximate range of human hearing is

20 hertz to 20,000 hertz

Before ice can form on a lake, all the water in the lake must be cooled to

4 degrees C

The speed of a sound wave in air depends on

air temperature

The Doppler effect is a characteristic of

all of the above choice (water, sound, and light waves)

The vibrations of a longitudinal wave move in a direction

along the direction of wave travel

The technology for orbiting solar power plants

already exists.

Like a transverse wave, a longitudinal wave has

amplitude, frequency, wavelength, and speed

The vibrations of a transverse wave move in a direction

at right angles to the direction of wave travel

Heat energy is measured in units of

both joules and calories (Choices A and B are both true)

A dolphin perceives its environment by the sense of

both sight and sound

Which body glows with electromagnetic waves?

both the Sun and the Earth

When a bimetallic bar made of copper and iron strips is heated, the bar bends toward the iron strip. The reason for this is

copper expands more than iron

A Doppler effect occurs when a source of sound moves

either towards you or away from you

When warm air rises, it

expands and cools

Compared to a glass of ice water with ice in it, on a warm day a glass of pure ice-cold water without ice will warm up

faster

Energy transfer by convection is primarily restricted to

fluids

For FM radio, the F stands for

frequency

Which of the following normally warms up fastest when heat is applied?

iron

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

is a better insulator than tile.

When the air pressure is lower

it takes less heat to boil water

If we slowly pump out all the air over a bowl of water until it is in a vacuum,

it will boil, then freeze

When an iron ring is heated, the hole becomes

larger

A sound wave is a

longitudinal wave

Compressions and rarefactions are characteristic of

longitudinal waves

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

looseness of outer electrons in metal atoms.

The frequencies of sound that carry farther in air are

low

A substance that heats up relatively quickly has a

low specific heat

The fact that desert sand is very hot in the day and very cold at night is evidence that sand has

low specific heat

Adding pressure to ice causes ice to

melt

A node is a position of

minimum amplitude

To say that one wave is out of phase with another is to say that the waves are

reaching maximum amplitude at different times.

When a gas is changed to a liquid state, the gas

releases energy

The pendulum with the greatest frequency is the pendulum with the

shortest length

The natural frequency of an object depends on its

size, shape, and elasticity

The higher the temperature of an object

the shorter the wavelengths it radiates.

A wiggle in time, but not in space, is a

vibration

When water in the vapor phase condenses to liquid in the air, the surrounding air

warms