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Fundamentals of Physics > Section 3 > Flashcards

Section 3 Flashcards

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1
Q

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

A

from your finger to the ice.

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2
Q

A substance that heats up relatively quickly has a

A

low specific heat.

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3
Q

Heat energy is measured in units of

A

calories and joules.

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4
Q

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

A

high specific heat.

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5
Q

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

A

4 degrees C.

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6
Q

Substances absorb heat energy by the process of: a) conduction; b) convection; c) radiation; d) all of these.

A

d) all of these.

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7
Q

A good heat conductor is: a) a poor insulator; b) a good insulator; c) neither a poor nor a good insulator.

A

a) a poor insulator.

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8
Q

Energy transfer by convection is primarily restricted to

A

fluids.

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9
Q

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.

A

b) the shorter the wavelengths it radiates.

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10
Q

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

a) internal energy and temperature must decrease.

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11
Q

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

a) both the Sun and Earth.

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12
Q

The planet Earth loses heat mainly by

A

radiation.

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13
Q

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

a) Temperature.

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14
Q

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

a) increases more.

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15
Q

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.

A

b) 2 degrees C.

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16
Q

When a sample of 0 degrees C water is heated, it first

A

contracts.

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17
Q

When a sample of 4 degrees C water is cooled, it

A

expands.

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18
Q

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

a) the ground warms more than water in the daytime.

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19
Q

A hot pizza placed in the snow is a net: a) absorber; b) emitter; c) both a. and b.; d) none of the above.

A

b) emitter.

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20
Q

Which melts faster in sunshine: dirty snow or clean snow?

A

Dirty snow

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21
Q

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

a) in a warm room.

22
Q

When snow forms in clouds, the surrounding air is: a) cooled; b) warmed; c) insulated; d) thermally conducting.

A

b) warmed.

23
Q

Ice is put in a picnic cooler. To speed up the cooling of cans of beverage, it is important that the ice

A

melts.

24
Q

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.

A

b) boiling point is lower with lower atmospheric pressure.

25
Q

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.

A

d) all of the above.

26
Q

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.

A

c) remain the same.

27
Q

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

a) it will increase.

28
Q

The pendulum with the greatest frequency is the pendulum with the: a) greatest mass; b) shortest length; c) least mass; d) greatest amplitude.

A

b) shortest length.

29
Q

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

A

vibration.

30
Q

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.

A

b) at right angles to the direction of wave travel.

31
Q

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

a) along the direction of wave travel.

32
Q

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

A

2 hertz.

33
Q

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.

A

d) reaching maximum amplitudes at different times.

34
Q

Wave interference occurs for: a) sound waves; b) light waves; c) water waves; d) all of the above are correct.

A

d) all of the above are correct.

35
Q

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.

A

b) a source wave and its reflected wave are in phase.

36
Q

A node is a position of

A

minimum amplitude.

37
Q

An antinode is a position of

A

maximum amplitude.

38
Q

The Doppler effect is characteristic of: a) water waves; b) sound waves; c) light waves; d) all of the above.

A

d) all of the above.

39
Q

A Doppler effect occurs when a source of sound moves

A

either towards you or away from you.

40
Q

A sound wave is a

A

longitudinal wave.

41
Q

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.

A

c) steel.

42
Q

When air near the ground on a warm day is warmed more than the air above, sound tends to bed

A

upward.

43
Q

Caruso is said to have made a crystal chandelier shatter with his voice. This is a demonstration of

A

resonance.

44
Q

For FM radio, the F stands for

A

frequency.

45
Q

Interference is a property of: a) sound; b) light; c) both a. and b.; d) neither a. nor b.

A

c) both a. and b.

46
Q

Reverberations are best heard when you sing in a room with

A

hard-surfaced walls.

47
Q

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.

A

b) 680 m.

48
Q

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.

A

c) 0.002 s

49
Q

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

a) 1/20 second

50
Q

A sound source of high frequency has high

A

pitch.

Fundamentals of Physics (24 decks)

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