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Definitions Flashcards

(58 cards)

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1
Q

Principle of Superposition

A

When two or more waves meet at a point. The resultant displacement is the algebraic sum of each of the individual displacements

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2
Q

Diffraction

A

When a wave is incident on an edge of an obstacle and the wave bends or spreads

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3
Q

Tension

A

The force that is transmitted through a rope or cable when it pulls an object

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4
Q

Law of conservation of momentum

A

The total linear momentum of a closed system remains constant in direction and magnitude

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5
Q

Conditions for Standing Wave

A

When two waves of equal frequency moving in opposite directions meet and superimpose

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6
Q

Harmonic

A

A note whose frequency is a whole number multiple of the fundamental frequency

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7
Q

Coherent

A

Waves which have a constant phase relationship and have the same frequency

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8
Q

Electromotive Force (of battery)

A

It is the energy converted from chemical energy to electrical energy per unit charge
The energy transferred by a source in driving a unit charge round a complete circuit

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9
Q

Potential Difference (of battery)

A

The energy transferred to heat in a resistor per unit charge

The workdone in moving a unit of a positive test charg from one point to another between2 points in an electric field

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10
Q

Electrovolt

A

The energy acquired by an electron when it moves through a potential difference of one volt 1.6x10^-19 (the same a the charge of 1 electron)

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11
Q

Ohm’s Law

A

At a constant temperature, the potential difference across the ends of a conductor is directly proportional to the current flowing through the conductor

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12
Q

Resistance

A

It is the ratio between the potential difference across the ends of a conducotr and the cureent running through the conductor

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13
Q

Kirchoff’s Current Law

A

The sum of total current entering a junction or node is equal to the sum of the total current leaving the junction.
Conservation of charge

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14
Q

Kirchoff’s Voltage Law

A

In any closed loop, the sum of all the emfs around the loop is equal to the sum of all the voltage drops within the same loop

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15
Q

Work done by a gas

A

When a gas does work against constant external pressure by being expanded or compressed. Area under a pV graph

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16
Q

Buoyancy Force

A

Fb=W+T

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17
Q

Radiowaves

A

1-10^4m

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18
Q

Microwaves

A

10^-3 to 10^-1

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19
Q

Infrared waves

A

10^-6 to 10^-3

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20
Q

Visible waves

A

7x10^-7 to 4x10^-7

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21
Q

Ultraviolet

A

10^-8 to 10^-7

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22
Q

X rays

A

10^-10 to 10^-8

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23
Q

Gamma waves

A

10^-13 to 10^-10

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24
Q

Internal resistance

Study These Flashcards
A

The gradient of a EMF to Vexternal graph. Vexternal=Emf when the current is 0

25
Line of action
The geometric representation of how the force is applied. It is the line through the point at which the force is applied
26
Couple
2 parallel forces that are equal in magnitude but opposite in direction and do not share a line of action
27
Elastic collisions
When the relative speed of approach and the relative speed of separation of two bodies is the same before and after the collision
28
Electric Field Strength
The force that a unit of a positive test charge experience at a point in an electric field
29
Electric Field
The region around an electric charge where another charged object experiences an electrostatic force
30
Velocity
The change in displacement over time taken
31
Conditions for Equilibrium no velocity
The alegebraic sum of the forces acting on the object in any direction must be zero. No resultant force The alegebraic sum of the moments about any pont must be zero
32
Conditions for Equilibrium in relation to velocity
The object is in equilibrium when it has a constant velocity and NO RESULTANT FORCE
33
Oil droplet in Equilibrium in a electric field and gravitational field
It is in equilibrium because the electric FORCE upwards. The weight FORCE and the electric FORCE are equal.
34
Oil droplet accelerates downwards in an electric field and gravitational field
The electric FORCE has decreased because the electric field is weaker. The weight FORCE is greater than the electric FORCE and thus the oil droplet ACCELERATES downwards.
35
What does Gold foil experiment reveal
The mass of the atom is concentrated in the nucleus. The nucleus in positiviely charged. Anything reasonable
36
Charge of strange quark
-1/3e
37
Strangeness of a strange quark
-1
38
Charge of an up quark
+2/3e
39
Charge of a down quark
-1/3e
40
Principle of Moments
For a body in equilibrium the total sum of the clockwise moments about a point is equal to total sum of the anticlockwise moments about the same point
41
Why you can ignore air resistance with heavier objects
The weight force is must greater than the force due to air resistance. The air resistance is NEGLIGIBLE COMPARED to the weight
42
How an intensity maximum is created at a point
The waves must be in phase The waves must have a path difference of n lambda The waves must constructively interfere The waves must meet at a point
43
How an intensity minimum is created at a point
The waves must be out of phase by 180 The waves must have a bath difference of n-1/2 lambda The waves must destructively interfere with a crest and trough meeting The waves must meet a point
44
When drawing a graph with weird stuff
Equate the axes to from something that you can understand. Substitute random values to double check
45
Kirchoff's First Law
The total sum of the current entering a junction or a node is equal to the total sum of the current exiting a node
46
Wavelength of progressive wave
Distance between 2 abjacent wavefronts
47
Displacement
The distance travelled in a specified direction by an object
48
How a stationary wave is formed on the string
Incident wave reflects at a fixed point/end. The incident and reflected waves superimpose (if the question ask the same question with regard to the principle of superposition just add the the resultant displacement of two waves meeting at point etc.)
49
Energy transformation of pd across a resistor
Electrical energy converted to thermal energy per unit charge
50
What is meant by kinectic energy
The energy of an object due to its motion/velocity
51
Formula for length of string in standing waves
L=n/2 lambda
52
Formula for length of open pipe in standing waves
L=n/2 lambda
53
Formula for lenght of closed pipe in standing waves
L=n/4 lambda
54
Newton's First law of motion
A body continues at rest or constant velocity unless acted upon by a resultant force.
55
Resultant force tension and weight relationship
Fres=T-W | Depends on the situation as well
56
Volt
Joule/coulomb
57
Antinode
It is a point of maximum amplitude on a stationary wave
58
Node
It is a point of minimum amplitude on a stationary wave

Physics Definitions (1 decks)

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