Section 3 Flashcards
When you touch a cold piece of ice with your finger, energy flows
from your finger to the ice.
A substance that heats up relatively quickly has a
low specific heat.
Heat energy is measured in units of
calories and joules.
The moderate temperatures of islands throughout the world has much to do water’s
high specific heat.
Before ice can form on a lake, all the water in the lake must be cooled to
4 degrees C.
Substances absorb heat energy by the process of: a) conduction; b) convection; c) radiation; d) all of these.
d) all of these.
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.
Energy transfer by convection is primarily restricted to
fluids.
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.
If a solid object radiates more energy than it absorbs, its: a) internal energy and temperature must decrease; b) temperature must decrease; c) internal energy must decrease; d) none of the above choice are true.
a) internal energy and temperature must decrease.
Which body glows with electromagnetic waves: a) both the Sun and Earth; b) only the Sun; c) only the Earth; d) neither the Sun or the Earth.
a) both the Sun and Earth.
The planet Earth loses heat mainly by
radiation.
There is twice as much molecular kinetic energy in 2 liters of boiling water as in 1 liter of boiling water. Which will be the same for both: a) Temperature; b) Thermal energy; c) both a. and c.; d) neither a. nor b.
a) Temperature.
The same quantity of heat is added to different amounts of water. The temperature of the smaller amount of water: a) increases more; b) decrease more; c) does not change; d) not enough information.
a) increases more.
You heat a half-cup of tea and its temperature rises by 4 degrees C. How much will the temperature rise if you add the same amount of heat to a full cup of tea: a) 0 degrees C; b) 2 degrees C; c) 4 degrees C; d) 8 degrees C.
b) 2 degrees C.
When a sample of 0 degrees C water is heated, it first
contracts.
When a sample of 4 degrees C water is cooled, it
expands.
Sea breeze in the day time is the reason of: a) the ground warms more than water in the daytime; b) the ground cools more than water in the daytime; c) radiation.
a) the ground warms more than water in the daytime.
A hot pizza placed in the snow is a net: a) absorber; b) emitter; c) both a. and b.; d) none of the above.
b) emitter.
Which melts faster in sunshine: dirty snow or clean snow?
Dirty snow
Frozen food will warm faster: a) in a warm room; b) in a cold room; c) the same speed in a warm room as in a cold room.
a) in a warm room.
When snow forms in clouds, the surrounding air is: a) cooled; b) warmed; c) insulated; d) thermally conducting.
b) warmed.
Ice is put in a picnic cooler. To speed up the cooling of cans of beverage, it is important that the ice
melts.
Why water boils at 95 degrees C in Denver, CO (high altitude) instead of 100 degrees C (sea level): a) boiling point is lower with higher atmospheric pressure; b) boiling point is lower with lower atmospheric pressure.
b) boiling point is lower with lower atmospheric pressure.
The process of boiling: a) cools the water being boiled; b) depends on atmospheric pressure; c) is a change of phase below the water surface; d) all of the above.
d) all of the above.
A 1-meter-long pendulum has a bob with a mass of 1 kg. Suppose that the bob is now replaced with a different bob of mass 2 kg, the period of the pendulum will: a) double; b) halve; c) remain the same; d) there is not enough information.
c) remain the same.
A 1-meter-long pendulum has a bob with a mass of 1 kg. Suppose that the bob is now tied to a different string so that the length of the pendulum is now 4 m. How will the period of the pendulum change: a) it will increase; b) it will decrease; c) it will remain the same; d) there is not enough information.
a) it will increase.
The pendulum with the greatest frequency is the pendulum with the: a) greatest mass; b) shortest length; c) least mass; d) greatest amplitude.
b) shortest length.
A wiggle in time, but not in space, is a
vibration.
The vibrations of a transverse wave move in a direction: a) along the direction of wave travel; b) at right angles to the direction of wave travel; c) that changes with speed.
b) at right angles to the direction of wave travel.
The vibrations of a longitudinal wave move in a direction: a) along the direction of wave travel; b) at right angles to the direction of wave travel; c) that changes with speed.
a) along the direction of wave travel.
An object that completes 20 vibrations in 10 seconds has a frequency of
2 hertz.
To say that one wave is out of phase with another is to say that the waves are: a) different amplitudes; b) different frequencies; c) different wavelengths; d) reaching maximum amplitudes at different times; e) all of these.
d) reaching maximum amplitudes at different times.
Wave interference occurs for: a) sound waves; b) light waves; c) water waves; d) all of the above are correct.
d) all of the above are correct.
A standing wave occurs when: a) two waves overlap; b) a source wave and its reflected wave are in phase; c) the speed of the wave is zero or near zero; d) the amplitude of a wave exceeds its wavelength.
b) a source wave and its reflected wave are in phase.
A node is a position of
minimum amplitude.
An antinode is a position of
maximum amplitude.
The Doppler effect is characteristic of: a) water waves; b) sound waves; c) light waves; d) all of the above.
d) all of the above.
A Doppler effect occurs when a source of sound moves
either towards you or away from you.
A sound wave is a
longitudinal wave.
Sound travels faster in: a) air; b) water; c) steel; d) a vacuum; e) sound travels at about the same speed in all of the above media.
c) steel.
When air near the ground on a warm day is warmed more than the air above, sound tends to bed
upward.
Caruso is said to have made a crystal chandelier shatter with his voice. This is a demonstration of
resonance.
For FM radio, the F stands for
frequency.
Interference is a property of: a) sound; b) light; c) both a. and b.; d) neither a. nor b.
c) both a. and b.
Reverberations are best heard when you sing in a room with
hard-surfaced walls.
You hear thunder 2 seconds after you see a lightning flash. How far away is the lightning: a) 340 m; b) 680 m; c) less than 340 m; d) There’s no way to tell.
b) 680 m.
A sound wave has a frequency of 500 Hz. What is the period of vibration of the air molecules due to the sound wave: a) 1 s; b) 0.01 s; c) 0.002 s; d) 0.005 s.
c) 0.002 s
If the frequency of a particular wave is 20 Hz, its period is: a) 1/20 second; b) 20 seconds; c) more than 20 seconds; d) none of the above.
a) 1/20 second
A sound source of high frequency has high
pitch.
