j Flashcards

(80 cards)

1
Q

What is the Principle of a Potential Divider?

A

When two resistors are used in series, the input voltage is applied across both resistors and the output voltage is taken across one of them.

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2
Q

What is Superposition?

A

When at least two waves meet at a point, the resultant displacement is the algebraic sum of the displacement of each wave.

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3
Q

What does Kirchoff’s second law state?

A

The sum of the e.m.f.s is equal to the sum of the p.d.s in a closed loop.

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4
Q

What does Kirchoff’s first law state?

A

The sum of the currents entering any junction is always equal to the sum of the currents leaving the junction.

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5
Q

What is the Conservation of Charge?

A

The law that states that charges are neither created nor destroyed but only transferred from one material to another.

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6
Q

What is Ohm’s Law?

A

The current in a conductor is directly proportional to the potential difference across its ends provided that temperature remains constant.

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7
Q

What is the principle of superposition?

A

The idea that we can get the resultant wave from adding two waves at a point.

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8
Q

What is Malus’s Law?

A

The intensity of light is proportional to the (amplitude)^2. Transmitted intensity I=E^2.

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9
Q

What does Hooke’s Law state?

A

Extension is directly proportional to force until the spring reaches its elastic limit.

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10
Q

What is Archimede’s Principal?

A

The weight of the liquid displaced is equal to the volume of the object.

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11
Q

What does Newton’s Second Law (in terms of momentum) state?

A

The resultant force acting on an object is directly proportional to the rate of change of the linear momentum of that object.

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12
Q

What does Newton’s First Law (in terms of momentum) state?

A

The momentum of an object remains the same unless the object experiences an external force.

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13
Q

What is Newton’s Third Law of Motion?

A

When two bodies interact, the forces they exert on each other are equal in magnitude and opposite in direction.

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14
Q

What does Newton’s Second Law state?

A

For a body of constant mass, its acceleration is directly proportional to the resultant force applied to it.

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15
Q

What does Newton’s First Law state?

A

An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force.

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16
Q

What is the principle of conservation of energy?

A

The total energy of an isolated system remains constant.

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17
Q

What is the Principle of conservation of momentum?

A

Total momentum of a system remains the same before and after a collision.

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18
Q

What is the Doppler effect?

A

An observed change in the frequency of a wave when the source or observer is moving.

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19
Q

What is displacement?

A

The total distance traveled in relation to a point in a particular direction.

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20
Q

What is distance?

A

The amount of space traveled by an object.

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21
Q

What is speed?

A

The rate at which an object moves.

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22
Q

What is velocity?

A

The speed of an object in a particular direction, the rate of change of displacement.

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23
Q

What is a scalar?

A

A physical quantity that has magnitude only.

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24
Q

What is a vector?

A

A quantity that has magnitude and direction.

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25
What is acceleration?
The rate of change of velocity of an object.
26
What is uniform acceleration?
When the velocity of a body increases by equal amounts in equal intervals of time.
27
What is mass?
The property of an object that resists change in motion.
28
What is linear momentum?
The product of mass and velocity.
29
What is force?
Rate of change of momentum.
30
What is weight?
The effect of a gravitational field on a mass.
31
What is load?
The force exerted on an object.
32
What is path difference?
The extra distance travelled by one wave compared with another in terms of wavelength.
33
What is a node?
A point on a stationary wave where the amplitude is zero.
34
What is an anti-node?
A point on a stationary wave where the amplitude is a maximum.
35
What is an isotope?
Forms of the same element with different number of neutrons in its nuclei.
36
What is a quark?
A fundamental particle with six flavors.
37
What is an anti-particle?
A particle of the same mass and magnitude of charge but opposite charge.
38
What is a hadron?
A particle made of quarks.
39
What is a baryon?
A hadron made of 3 quarks.
40
What is a meson?
A hadron made of a quark and an anti-quark.
41
What is a lepton?
A fundamental particle not affected by the strong nuclear force.
42
What is dispersion?
The splitting of light into its component wavelengths.
43
What is interference?
The cancellation and reinforcement of two waves when they pass through the same point.
44
What is coherence?
When two waves have a constant phase relationship.
45
What is diffraction?
The spreading of a wave at an edge or slit.
46
What is a stationary wave?
A wave pattern produced when two progressive waves of the same speed and frequency travel in opposite directions.
47
What is polarization?
The process of restricting the oscillations of a transverse wave to be in one phase.
48
What is the electromagnetic spectrum?
The family of waves that travel through a vacuum at the speed of light.
49
What is intensity?
The power transmitted normally per unit cross-sectional area.
50
What is amplitude?
The maximum displacement from the equilibrium position of a wave.
51
What is wavelength?
The distance between two adjacent nodes or anti-nodes.
52
What is frequency?
The number of complete oscillations that pass through a point in a unit time.
53
What is period?
The time taken to complete one oscillation.
54
What is phase difference?
A measure of the amount by which one oscillation of a wave leads/lags another expressed as an angle.
55
What is resistivity?
A measure of the electrical resistance.
56
What does quantised mean?
When a quantity has a definite minimum magnitude and always comes in multiples of that magnitude.
57
What is resistance?
Ratio of the potential difference across a component to the current in the component.
58
What is a charge carrier?
A particle which contributes to an electrical current.
59
What is elementary charge?
The smallest unit of electric charge that is possible in ordinary matter.
60
What is electromotive force (emf)?
A source as energy transferred per unit charge in driving charge around a complete circuit.
61
What is terminal potential difference?
The potential difference across an external resistor connected across a source emf.
62
What is potential difference?
Energy transferred per unit charge as it passes between two points.
63
What is a perfectly elastic collision?
The relative speed of approach is equal to the relative speed of separation.
64
What is torque?
A rotational force - the product of one of the forces and the perpendicular distance between the forces.
65
What is a couple?
A pair of equal and opposite forces that act on an object at different points and produce rotation only.
66
What is the principle of moments?
The sum of the clockwise moments is equal to the sum of the anticlockwise moments provided the object is in equilibrium.
67
What is equilibrium?
When there is no resultant force and no resultant torque.
68
What is the moment of force?
The moment of a force about a point is the product of the force and the perpendicular distance from the line of action of the force to the point.
69
What is the center of gravity?
Point where the weight of an object is taken to act.
70
What is terminal velocity?
The maximum velocity reached by an object falling under gravity or accelerated by a constant force.
71
What is Normal (Contact) Force?
The force at right angles to a surface when two objects are in contact.
72
What is electric current?
A flow of charge carriers.
73
What is Young's modulus?
A ratio of tensile stress to tensile strain.
74
What is strain?
The extension per unit length produced by tensile or compressive forces.
75
What is stress?
The force per unit cross-sectional area.
76
What is density?
Mass per unit of volume of a material.
77
What is pressure?
The force acting normally per unit area of a surface.
78
What is power?
Work done per unit time.
79
What is efficiency?
The ratio of useful energy output from the system to the total energy input.
80
What is work done?
A force times the displacement it acts in the direction of the force.