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Physics 6C > Midterm I > Flashcards

Midterm I Flashcards

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1
Q

Electric and magnetic fields are “in phase” which means that

A

they each are zero at the same points and reach their maxima at the same points in space

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2
Q

very far from the antenna the filed lines are quite flat over a reasonably large area and the waves are referred to as

A

plane waves

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3
Q

B and E are perpendicular to each other and to the direct of travel OR

A

direction of wave velocity

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4
Q

EM are – waves because the amplitude is perpendicular to the direction of wave travel

A

transverse

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5
Q

EM waves are always aves of – not of matter so they can propagate in empty space

A

fields

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6
Q

– electric charges gives rise to EM waves

A

accelerating

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7
Q

free space

A

no charges or conduction currents

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8
Q

speed of EM waves in empty space =

A

speed of light

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9
Q

The net magnetic flux through a closed surface is

A

zero

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10
Q

Gauss’s law for magnetism concludes that isolated magnetic poles

A

do not exist

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11
Q

An electric field is produced by a

A

changing magnetic field

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12
Q

A changing electric field will produce a

A

magnetic field

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13
Q

Electromagnetic waves are

A

transverse

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14
Q

Far from their source, EM waves are

A

plane waves

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15
Q

In the radiation field from an antenna, the E and B fields are – to one another

A

perpendicular

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16
Q

Right hand rule for the direction of propagation of the EM waves

A

point fingers of your right hand toward the E vector, curl your fingers towards the B vector, and the thumb will point the direction of propagation

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17
Q

If an EM wave has it magnetic field oscillating in the vertical direction, the direction of oscillation of the electric field is

A

horizontal

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18
Q

If the magnetic field in an EM wave is in the x-direction and the electric field in the wave is in the y-direction so the wave is traveling in the

A

negative z direction

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19
Q

An EM wave is propagating towards the west. At a certain moment the direction of the magnetic field vector points vertically up. What is the direction of the electric field vector?
(Horizontal or vertical, pointing south or down or north or up or east)

A

horizontal and south

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20
Q

An EM wave propagates along the + y direction. If the E-field at the origin is along the +z direction what is the direction of the B-field?

A

+ x direction

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21
Q

E vector is in the +z direction, the B vector is the the +x direction what is the direction of propagation of the EM wave?

A

+ y direction

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22
Q

Shortest wavelength: microwaves, IR, gamma rays, x-rays, UV

A

gamma rays

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23
Q

Order from low to high frequencies: radio waves, IR, Microwaves, UV, visible, x-rays, gamma rays

A

radio waves, microwaves, IR, visible, UV, x-rays, gamma rays

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24
Q

the energy per unit volume in an EM wave is – divided between E and B fields

A

equally

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25
Q

the force per unit area exerted by an EM wave is called

A

radiation pressure

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26
Q

– objects receives a larger amount of momentum

A

reflecting

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27
Q

an AM radio station indicates its location on the dial as 1030 –

A

kHz

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28
Q

Reflection, refraction, and the formation of images by mirrors and lenses has been successfully described by the

A

ray model of light

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29
Q

The angle of incidence must – the angle of reflection

A

equal

30
Q

Describe the imaged formed by a plane mirror.

A

virtual and upright

31
Q

plane mirrors produce images which are always –

A

the same size as the actual object

32
Q

an image formed by a plane mirror is at a – the distance behind the mirror as the object is in front of the mirror

A

same

33
Q

An image formed when the light rays do not actually pass through the image location and would not appear on paper or film placed at that location is called

A

virtual image

34
Q

an image formed when the light rays pass through the image location and could appear on paper or film at that location is called

A

real image

35
Q

Is it possible to see a virtual image?

A

Yes, the rays that appear to emanate from a virtual image can be focuses on the retina just like those from an illuminated object

36
Q

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

A

180 degrees

37
Q

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

A

half your height

38
Q

A concave mirror has a – focal length

A

positive

39
Q

A convex mirror has a – focal length

A

negative

40
Q

To find an image by ray tracing requires – rays

A

two

41
Q

A beam of light that is parallel to the principal axis is incident on a concave mirror. What happens to the reflected beam of light?

A

It passes through the focal point of the mirror

42
Q

A beam of light is parallel to the principal axis is incident on a convex mirror. What happens to the reflected beam of light?

A

It appears to be coming from the focal point on the other side of the mirror

43
Q

A light ray, traveling obliquely to a concave mirror’s axis, crosses the axis at the mirror’s center of curvature before striking the mirror’s surface. After reflection, this ray passes through the mirror’s –

A

center of curvature

44
Q

A light ray, traveling obliquely to a concave mirror’s surface, crosses the axis at the mirror’s focal point before striking the mirror’s surface. After reflection, this ray travels – to the mirror’s axis

A

parallel

45
Q

If the image distance is positive, the image formed by a mirror is

A

real

46
Q

If the image distance is negative, the image formed by a mirror is

A

virtual

47
Q

If the absolute value of the magnification is larger than one, then the image is – than the object

A

larger

48
Q

If the absolute value of the magnification is smaller than one, then the image is – than the object

A

smaller

49
Q

when you stand in front of a concave mirror, exactly at its focal point

A

you won’t see your image because there is none

50
Q

if you stand in front of a convex mirror, at the same distance from it as the radius of curvature

A

you will see your image and you will appear smaller

51
Q

if you stand in front of a convex mirror at the same distance from it as its focal length

A

you will see your image and you will appear smaller

52
Q

an object placed in front of a convex mirror at a distance larger than twice the focal length of the mirror will have an image that

A

is upright and reduced

53
Q

concave spherical mirrors produce images which

A

could be smaller, larger, or the same size

54
Q

convex spherical mirrors produce images which

A

are always smaller than the actual object

55
Q

A single concave spherical mirror produces an image which is real only if the object distance is

A

greater than f

56
Q

A single convex spherical mirror produces an image which is (V or R)

A

always virtual

57
Q

If the magnification of a mirror is negative, then the image is

A

inverted and the mirror is concave

58
Q

For all transparent materials, the index of refraction is – to 1

A

greater than

59
Q

An index of refraction < 1 for a medium would imply that the speed of light in the medium is – than the speed of light in a vacuum

A

greater than

60
Q

An index of refraction of diamond is 2.42. This means that a given frequency of light travels 2.42 times faster in –

A

vacuum than it does in diamond

61
Q

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

A

decreases

62
Q

The angle of incidence is – the angle of refraction

A

may be >, <, or equal to

63
Q

Light traveling at an angle into a denser medium is refracted – the normal

A

toward

64
Q

Light enters air from water. The angle of refraction will be – the angle of incidence

A

greater than

65
Q

A ray of light, which is traveling in air, is incident on a glass plate at a 45 degree angle. The angle of refraction in the glass is – than 45 degrees

A

less than

66
Q

A beam of light in air is incident on a glass slab at an angle of incidence < 90 degrees. After entering the glass slab, the beam of light bends – to the normal drawn at the point of contact

A

towards

67
Q

At a quiet pond with crystal clear water, you decide to fish with bow and arrow. When you aim at the fish you see, you must aim

A

deeper than you perceive the fish to be

68
Q

The spreading of white light into its spectrum is called

A

dispersion

69
Q

When light passes through a prism the color refracted most is

A

violet

70
Q

Which color of light undergoes the smallest refraction when passing from air to glass?

A

red

71
Q

When sill the critical angle exist?

A

n1 > n2

Physics 6C (3 decks)

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