Brainscape's Knowledge GenomeTM


Top Flashcards (Certified)
All Flashcards

Physics Unit 2 > Unit 2 > Flashcards

Unit 2 Flashcards

0
Q

Define coherent

A

Two sources of wave are coherent if they emit waves with a constant phase difference

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
1
Q

Define Refractive Index

A

Speed of light in free space/ speed of light in the substance

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Define monochromatic

A

Containing or using only one colour

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Define diffraction grating

A

A plate with many closely ruled parallel slits on it

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

How is a stationary wave formed

A

A stationary wave is formed when two progressive waves pass through each other

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

What is a node

A

A fixed point in a stationary wave pattern where the amplitude is zero

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What is an antinode

A

A fixed point in a stationary wave pattern where the amplitude is a maximum

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What is path difference

A

The difference in distances from two coherent sources to an interference fringe

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

What is the principle of Superposition

A

That when two waves meet, the total displacement at a point is equal to the sum of the individual displacements at that point

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

How does laser light differ from lamplight

A

the light is highly monochromatic

It is a source of coherent light

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Uses of polarisation

A

Polaroid sunglasses

Radio signals

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Define plane polarisation

A

The process of restricting vibrations of waves to only one plane

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

List the major regions of the electromagnetic spectrum

A

Radio waves, microwaves, infrared radiation, light, ultraviolet radiation, x-rays, gamma radiation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Define transverse wave

A

Waves with a direction of vibration perpendicular to the direction of propagation of the waves

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

What is a longitudinal wave

A

Waves with a direction of vibration parallel to the direction of propagation of the waves

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

What is meant by phase

A

Can be expressed as the relative displacement between or among waves having the same frequency

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What is Young’s modulus

A

Stress divided by strain assuming the limit of proportionality has not been exceeded

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

What is meant by brittleness

A

The more material snaps without any noticeable yield the more Brittle it is

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

What is plastic behaviour

A

Plastic behaviour is when a material stays deformed after you have taken away the force

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

What is breaking stress

A

The tensile stress needed to break a solid material

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

Define tensile strain

A

Extension per-unit length of a solid when deformed

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

Define tensile stress

A

Force per unit area of cross-section in a solid perpendicular to the cross-section

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

Define elastic limit

A

The point beyond which wire is permanently stretched

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

The formulae for density

A

Density equals mass divided by volume

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
The formulae Power
Power equals force times speed
25
Define hookes law
The extension of a spring is proportional to the force needed to extend it
26
What is a couple
A pair of equal and opposite forces acting on a body but not along the same line
27
What is the principle of moments
For an object in equilibrium sum of the clockwise moment about any point is equal to the sum of the anticlockwise moments about that point
28
What is a vector quantity
Physical quantity with magnitude and direction
29
What is a scalar quantity
A physical quantity with magnitude only
30
Examples of vector quantities
Velocity, acceleration, force
31
Examples of scalar quantities
Distance, mass, volume
32
Define centre of mass
The centre of mass of a body is the point through which a single force on the body has no turning effect
33
What is newtons first law
The velocity of an object will not change unless a resultant force acts upon it
34
Newton's second Law
Acceleration is proportional to the force
35
Newtons third law
Each force has an equal but opposite reaction Force
36
Define the Newton
The measurement given full force | unit equals N
37
Define power
The rate of transfer of energy
38
Define work
Force multiplied by distance moved in the direction of the force
39
Name three types of renewable energy
Wind power, water power, solar power
40
Name types of potential energy
Elastic potential energy, gravitational potential energy, electrical potential energy, chemical potential energy
41
What is the principle of conservation of energy
Energy cannot be created or destroyed
42
Define Young's fringes
Parallel bright and dark fringes observed when light from a narrow slit passes through two closely spaced slits
43
Define yield point
Point at which the stress in a wire suddenly drops when the wire is subjected to increasing strain
44
Define weight
The force of gravity acting on an object
45
Define wavelength
The least distance between two adjacent vibrating particles with the same displacement and velocity at the same time
46
Define wavefronts
Lines of constant phase for example Wavecrests
47
Define velocity
Change of displacement per unit time
48
Define a torque of a couple
Force multiplied by perpendicular distance between the lines of action of the forces
49
Define thinking distance
The distance travelled by a vehicle in the time it takes the driver to react
50
What is a Thermistor
A resistor which is designed to have a resistance that changes with temperature
51
What is terminal speed
The maximum speed reached by an object when the drag force on it is equal and opposite to the force causing the motion of the object
52
Define stopping distance
Thinking distance plus the braking distance
53
What is the stiffness constant
The force per unit extension needed to extend a wire or a spring
54
Define refraction
Change of direction of a wave when it crosses a boundary where it changes speed
55
What is a projectile
A projected object in motion acted on only by the force of gravity
56
What is plastic deformation
The deformation of a solid beyond its elastic limit
57
Define phase difference
The fraction of a cycle between the vibrations of two vibrating particles measured in either radians or degrees
58
What is a period of a wave
Time for one complete cycle of a wave to pass a point
59
What is an optical fibre
A thin flexible transparent fibre used to carry light pulses from one end to the other
60
What is multi-path dispersion
The lengthening of a light pulse as it travels along an optical fibre, due to rays that repeatedly undergo total internal reflection having to travel a longer distance than rays that undergo less total internal reflection
61
What is a motive force
The force that drives a vehicle
62
What is the limit of proportionality
The limit beyond which, when a wire or spring is stretched its extension is no longer proportional to the force that stretches it
63
What is a laser
A device that produces a parallel coherent beam of monochromatic light
64
Define interference
The formation of points of cancellation and reinforcement where two coherent waves pass through each other

Physics Unit 2 (1 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions