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Physics 6C > Final > Flashcards

Final Flashcards

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1
Q

The ratio of energy to frequency for a photon gives

A

Planck’s constant

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2
Q

In the relativistic case, doubling the speed of an electron causes its wavelength to

A

decrease to less than one-half

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3
Q

If the position of an electron is measured very precisely there is an uncertainty in measuring its

A

momentum

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4
Q

The elements in the periodic table that have completely filled shells or subshells are referred to as

A

noble gases

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5
Q

Ionic bonding is caused by

A

the transfer of electrons between atoms

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6
Q

An unfilled electron state in the valence band is called

A

a hole

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7
Q

In beta minus decay, the number of neutrons in the nucleus

A

is decreased by 1

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8
Q

The fuel for nuclear fission

A

U

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9
Q

If the Earth is located 10% nearer to the Sun than the real location, what is the total sunshine energy on the Earth?

A

about 20% more

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10
Q

The Sun and planets formed about – years ago

A

5 billion

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11
Q

What is the electric charge of d-quark?

A

-1/3

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12
Q

What element (oxygen, iron, carbon, silver, silicon) was made only by the supernova explosion?

A

silver

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13
Q

The dark matter is expected to be attracted by –

A

gravity

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14
Q

The most stable element in the universe, one that is energetically unfavorable to both fission and fusion is

A

iron

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15
Q

The temperature of the universe at 1 second after the Big Bang was about

A

10^10 K

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16
Q

When light enters a material of higher index of refraction, its speed

A

decreases

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17
Q

A light ray is reflected by two mirrors that are perpendicular. The new direction of the ray is – degrees from the original direction

A

180

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18
Q

An object is placed in front of a convex mirror at a distance larger than twice the focal length of the mirror. The image will appear

A

upright and smaller

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19
Q

The chromatic aberration in lenses is due to the – of light by the lens

A

dispersion

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20
Q

A piece of wood is floating in a bathtub. A second piece of wood sits on tops of the first piece, and does not touch the water. If the top piece is taken off and placed in the water, what happens to the water level in the tub?

A

It does not change

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21
Q

Bernoulli’s principle is a statement of the conservation of

A

energy

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22
Q

When a bimetallic strip is heated, the strip will bend toward the side with the – coefficient of linear expansion

A

smaller

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23
Q

When both the pressure and the absolute temperature of an ideal gas are increased each by a factor of two, the volume occupied by the gas will

A

not change

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24
Q

A mole of diatomic oxygen molecules and a mole of diatomic nitrogen molecules at STP have the same number of –

A

molecules

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25
Q

A sample of an ideal gas is slowly compressed to 1/2 its original volume with no change in temperature. What happens to the average speed of the molecules in the sample?

A

it does not change

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26
Q

The heat required to change a substance form the solid to the liquid state is referred to as the

A

heat of fusion

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27
Q

The process whereby heat flows by means of molecular collisions is referred to as

A

conduction

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28
Q

Relative to a stationary observer, a moving object appears – than normal

A

shorter

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29
Q

What property of the beam of light applies to a laser beam?

A

it is coherent

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30
Q

The spreading of white light into its spectrum is called?

A

dispersion

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31
Q

If a person’s eyeball is too short rom front to back, the person is likely to suffer from

A

farsightedness

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32
Q

Farsightedness can usually corrected with

A

converging lenses

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33
Q

In a hydrogen atom, an electron is bound around a proton by –force

A

electromagnetic

34
Q

The time when the strong force is unified with electro-weak force

A

Grand Unification

35
Q

If the mirror diameter of the telescope becomes twice larger, the light-gathering power is

A

4 times better

36
Q

galaxies were formed as early as – after the Big Bang

A

1 billion years after

37
Q

Increasing wavelengths: radio, ultra-violet, visible, x-ray

A

x-ray, ultra-violet, visible, radio

38
Q

What natural barrier tries to prevent two protons from combining?

A

electromagnetic repulsion

39
Q

Which particle is the heaviest?

A

neutron

40
Q

In today’s Universe, compared to the number of photons, the number of electrons is

A

suppressed by more than a billion

41
Q

How many stars in our Universe?

A

10^22

42
Q

When atmospheric pressure increases, what happens to the absolute pressure at the bottom of a pool?

A

it increases by the same amount

43
Q

The energy per unit volume in an EM wave is – divided between the electric and magnetic fields

A

equally

44
Q

How tall must a plane mirror be in order for you to be able to see your full image in it?

A

half of your height

45
Q

For all transparent material substances, the index of refraction is – than 1

A

greater

46
Q

A telescope is considered to be a time machine looking backward, because speed of light is –

A

finite

47
Q

How large was the universe when the cosmic microwave background was released?

A

a factor of 1,100 smaller than today

48
Q

Who predicted the existence of anti-particles?

A

Dirac

49
Q

The mass of a positron is – as the electron

A

same

50
Q

Your hands are attached to your body by

A

electromagnetic force

51
Q

Quark names

A

up, down, charm, strange

52
Q

Why didn’t an abundance of elements heavier than helium form in the early universe? The expansion of the universe caused the – and – to drop too low for fusion to occur

A

temperature and density

53
Q

The Higgs mechanism explains the origin of

A

mass of particles

54
Q

The angle of incidence – than the angle of refraction

A

may be greater, less or equal

55
Q

When light passes through a prism the color refracted the most is

A

violet

56
Q

If a person’e eyeball is too long from front to back, the person is likely to suffer from

A

nearsightedness

57
Q

Nearsightedness can usually be corrected with

A

diverging lenses

58
Q

The equation of continuity is a statement of conservation of – applied to fluids in steady laminar flow?

A

mass

59
Q

The lift on an airplane wing is an application of

A

Bernoulli’s principle

60
Q

A metal cylindrical sleeve has an inner radius A and an outer radius B. The metal has a positive thermal expansion coefficient. When the sleeve’s temperature increases

A

both the inner and outer radii increase

61
Q

The number of molecules in on e mole of a substance is

A

the same for all substances

62
Q

The average molecular kinetic energy of a gas can be determined by knowing only

A

the temperature of the gas

63
Q

Is it possible to transfer heat from a hot reservoir to a cold reservoir?

A

yes it will happen naturally

64
Q

The type of heat transfer that occurs between warm food and the air in the room is principally

A

convective

65
Q

The redshift due to the Doppler effect is caused by the coerces of light moving – from the Solar System

A

away

66
Q

In a p-type semiconductor, a hole is

A

a region where an electron is missing

67
Q

The nuclei of different isotopes have the same number of

A

protons

68
Q

When an unstable nucleus decays by emitting an alpha particle, the atomic mass number of the nucleus

A

decreases by 4

69
Q

The energy radiated by a star, such as the Sun, results from

A

fusion reactions

70
Q

Boiling temperature of water is

A

373 Kelvin

71
Q

The beginning of the Universe was – dimensions

A

10

72
Q

How soon after the Big Bang did the universe become cool enough for neutral atoms to form (and thus the universe became transparent)?

A

300,000 years

73
Q

Electromagnetic radiation of 1 micron wavelength is called

A

infrared

74
Q

An example of an object which emits no radiation at all is

A

any object at a temperature of 0 K

75
Q

An iron core cannot support a star because iron cannot – with other nuclei to produce energy

A

fuse

76
Q

The deviation of a lens from its ideal behavior is referred to as

A

aberration

77
Q

What principle is responsible for alternating light and dark bands when light passes through two or more narrow slits?

A

interference

78
Q

What is the difference between pressures inside and outside a tire called?

A

gauge pressure

79
Q

Salt water has greater density than fresh water. A boat floats in both fresh and salt water. Where is the buoyant force greater?

A

same

80
Q

According to the quark model, neutrons consists of

A

2 d-quarks and 1 u-quark

81
Q

In today’s universe, compared to the number of protons, the number of anti-protons is

A

considered negligible

Physics 6C (3 decks)

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