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Chemistry/Physics > Physics > Flashcards

Physics Flashcards

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1
Q

How are stationary waves formed?

A

When 2 progressive waves with the same frequency moving in opposite directions superpose

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2
Q

Do quarks have baryon numbers?

A

Yes.
Up = 1/3
Down = 1/3
Strange = 1/3

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3
Q

What is impulse?

A

Change in momentum
Force x Time

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4
Q

What is material dispersion?

A

When the light entering a fibre optic cable has many different wavelengths (which travel at different speeds and therefore reflect by different angles)

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5
Q

What is modal dispersion?

A

When light entering a fibre optic cable enters at different angles, so the time it takes for one part is different from another

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6
Q

Between which lengths is the strong force attractive?

A

3 and 0.5 femtometres

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7
Q

What is the stopping voltage equal to?

A

eV = Ek

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8
Q

What is the centre of mass?

A

A single point that you can consider the whole of the weight to act from

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9
Q

What is the moment of a force?

A

The product of the force and the perpendicular distance from the line of action to the point

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10
Q

What is a couple?

A

2 equal and opposite forces that do not act in the same line

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11
Q

What are Newton’s 3 laws?

A

1st: the velocity of an object will not change unless a resultant force acts upon it
2nd: F=ma
3rd: every force has an equal and opposite force

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12
Q

What is terminal velocity?

A

The velocity when frictional forces are equal to driving forces, causing equilibrium and no acceleration

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13
Q

What is current?

A

The rate of flow of charge

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14
Q

What is the difference between electron flow and conventional current?

A

Electrons flow from negative to positive and conventional current is from negative to positive

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15
Q

What is potential difference?

A

The work done per coulomb of charge flowing in a circuit

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16
Q

What resistance does an ideal voltmeter have?

A

Infinite (so that no current is drawn from the circuit)

17
Q

What is an ohmic conductor?

A

A conductor through which the current flow is proportional to the resistance when held at a constant temperature

18
Q

What happens to LDRs and Thermistors when the light level and temperature increases?

A

Their resistance decreases

19
Q

What is power?

A

The rate of energy transfer

20
Q

What benefits does the electron diffraction method have over the closest approach?

A

The closest approach method measures gives an upper limit for the radius; the electron diffraction measures it. The distance depends on the alpha particles’ kinetic energy. The alpha particle method is a calculation, electron diffraction is a measurement.

21
Q

Range of the weak force

A

<0.1fm

22
Q

Relative mass of an electron

A

1/2000

23
Q

AXZ notation

A

A = nucleon number, X = symbol for element, Z = proton number

24
Q

When does the equilibrium position between 2 nucleons occur?

A

Around 0.5fm

25
Q

Photon definition

A

A discrete packed of electromagnetic energy

26
Q

Can there be quarks and antiquarks making up the same baryon?

A

NO

27
Q

Why are pions so stable?

A

They’re the lightest meson

28
Q

Do strange quarks increase or decrease particle lifetimes?

A

Increase

29
Q

Will a kaon decay into a single pion?

A

NO

30
Q

Which is heavier, the electron or the muon?

A

Muon

31
Q

Specific charge of a nucleus definition

A

RATIO of charge to mass in a nucleus

32
Q

What is annihilation used for?

A

PET scanners

33
Q

How is pair production started?

A

A photon interacts with an electron/nucleus/aton

34
Q

How is pulse broadening lessened?

A

Making the core very narrow, monochromatic light and optical fibre repeaters

35
Q

What is the principle of momentum?

A

Total momentum before an event is equal to total momentum after, so long as no external resultant force acts (so its an isolated system)

36
Q

What is damping

A

When force opposes motion

37
Q
A

Chemistry/Physics (7 decks)

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