Test 2

Question 1

The theory that describes how objects that are moving in a straight line at a constant speed behave at high speeds?

Answer 1

Special theory of relativity

Question 2

The shortening of an object along its direction of motion for an object that is moving near the speed of light as measured from an observer that is not moving with the object?

Answer 2

Length contraction

Question 3

The idea that motion is only defined relative to other objects and there is no such thing as absolute motion

Answer 3

relativity

Question 4

A state of motion for an object that is undergoing an acceleration?

Answer 4

non-inertial reference frame

Question 5

The slowing of a clock as an object moves near the speed of light as measured by an observer who is not moving with the object

Answer 5

Time dilation

Question 6

A state of motion for objects that are moving in a straight line at a constant speed

Answer 6

inertial reference frame

Question 7

T or F

Moving objects appear to be shorter than when they are at rest

Answer 7

True

Question 8

T or F

Moving clocks run fast

Answer 8

False

Question 9

T or F

Two events that are simultaneous on one reference frame are always simultaneous in another reference frame

Answer 9

False

Question 10

A train moving near the speed of light enters a tunnel. According to a person sitting in the middle of the train, the back end of the train enters the tunnel just as the front end is emerging. What happens according to someone standing in the middle of the tunnel?

Answer 10

The person in the tunnel sees the back end of the train enter before the front end emerges

Question 11

A distant star is moving toward the earth at a speed of 1/4 the speed of light. Compared to the light from a flashlight on the earth, the speed of the light from the star would be…

Answer 11

The same speed

Question 12

You are in a spaceship moving in a straight line at constant speed. You cannot see out of the ship. Assuming perfectly uniform motion, which of the following is true…

Answer 12

There is no experiment you can do to determine that you are moving.

Question 13

A measure of an objects rotational motion, massvelocityradius

Answer 13

angular momentum

Question 14

The number of protons plus neutrons in the nucleus of an atom

Answer 14

atomic mass number

Question 15

An object’s mass times its velocity for an object moving in a straight line

Answer 15

Linear momentum

Question 16

When a spinning figure skater pulls her arms in, she spins faster. Which law applies here?

Answer 16

Conservation of angular momentum

Question 17

A piece of wood is burned in a fireplace. Which of the following is true about the situation?

Answer 17

Mass is conserved, Total energy is conserved, electric charge is conserved.

Question 18

A stick of dynamite explodes. How does the momentum of the dynamite before the explosion compare to the total momentum of all the pieces immediately after the explosion?

Answer 18

The momentum is the same just before and after the dynamite explodes

Question 19

When the dynamite in the previous question explodes, what happens to its mass?

Answer 19

All the mass is there but some of the atoms have recombined into different molecules and dissipated through the air.

Question 20

A neutron has no charge. When a neutron is left out in empty space by itself will decay after a few minutes. When this happens, the neutron will emit an electron which has a negative charge, and a neutrino which has no charge. What should the resulting charge of the particle be that is left after this decay process? (hint: think about conservation of charge)

Answer 20

+1

Question 21

Transferring heat or energy directly from a source with the energy being transferred by photons (visible light, x-rays, microwaves, ect.)

Answer 21

Radiation

Question 22

The kinetic energy of the random motion of molecules in a material

Answer 22

Thermal energy

Question 23

The energy of an object associated with the mass of the object and how fast it is moving

Answer 23

Kinetic energy

Question 24

transferring heat or energy when objects with different temperatures are in direct contact with each other

Answer 24

Conduction

Question 25

Energy stored in the nucleus of an atom

Answer 25

nuclear potential energy

Question 26

The energy that depends on how close electrical charges are to each other

Answer 26

Electrical potential energy

Question 27

Transferring heat or energy when a hot material moves and transfers heat to a cool material

Answer 27

Convection

Question 28

Internal energy stored from stretching of compressing a material

Answer 28

Elastic potential energy

Question 29

The energy stored in an object with potential to fall and depends on the objects massgravityheight

Answer 29

gravitational potential energy

Question 30

energy stored in the physical and chemical states of matter

Answer 30

Chemical potential energy

Question 31

A skier is skiing downhill, with friction. From this information, which of the following must be true?

Answer 31

His gravitational potential energy is decreasing.

Question 32

You sit on a hot stove. Energy is transferred into your seat by the process of…

Answer 32

Conduction

Question 33

Suppose an object is moving away from you with a speed near the speed of light. Which of the following choices is true?

Answer 33

A clock traveling with the object seems to run slower than when the object is at rest.

Question 34

A mass on a spring is bouncing up and down. Which of the following are conserved…

Answer 34

The total energy.

Question 35

The canceling and enhancing effect that occurs when two waves move through the same space at the same time

Answer 35

Interference

Question 36

The maximum amount that a particle will be displaced from its normal position when a wave passes through it

Answer 36

Amplitude

Question 37

The number of wave crests that pas a particular point in space every second

Answer 37

frequency

Question 38

changing direction when passing through one medium to another

Answer 38

refraction

Question 39

changing direction of waves to bend around corners and spread out as they pass through an opening

Answer 39

diffraction

Question 40

A wave where the energy travels at right angles to the direction the wave is being driven

Answer 40

Shear wave

Question 41

a longitudinal wave driven by a force of pressure

Answer 41

Compression wave

Question 42

The distance between two crests or troughs of a wave

Answer 42

wavelength

Question 43

bouncing off of a surface

Answer 43

reflection

Question 44

a change in the observed frequency of a wave when the source and observer are moving relative to each other

Answer 44

Doppler effect

Question 45

Suppose you are in a room with no windows and no lights on but the door is wide open. Light from the hall fills most of the room. The light entering the room can best be explained by

Answer 45

reflection

Question 46

What is an example of refraction

Answer 46

eyeglasses correcting a persons vision

Question 47

What is a similar characteristic between blue light and red light

Answer 47

They travel at the same speed.

Question 48

If you increase the amplitude of the sound wave, what else will happen?

Answer 48

The sound wave will become louder.

Question 49

When light is shined through two closely spaced slits, a pattern of dark and light spots appears. This proves that light has which wave like property?

Answer 49

interference

Question 50

Waves may be observed to feflect, refract, diffract, and interfere. We can observe particles to have two of these properties. Which two properties can we observe for waves but not for particles?

Answer 50

Diffraction and interference

Question 51

Which of the following is the best description of a photon?

Answer 51

A particle without mass and with no charge.

Question 52

The energy of a photon is related to its

Answer 52

Frequency

Question 53

When sunlight passes through a large opening, such as a door or window, it makes a bright spot about the size of the opening, but when light passes through a very small opening, such as a pin hole, it spreads out over an area much larger than the size of the opening. This occurs because light…..

Answer 53

has wave properties

Question 54

What did Einstein’s photoelectric effect experiment prove about the nature of light?

Answer 54

Light has particle properties.