Chemistry Physics at University Of Oxford | Flashcards & Summaries

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# Lernmaterialien für chemistry physics an der University of Oxford

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TESTE DEIN WISSEN
How to find wavelength of an e- accelerated through a pd

Potential is known
Lösung anzeigen
TESTE DEIN WISSEN
qV=1/2mv2
P=mv=h/lambda

Don’t want velocity so substitute and eliminate it to find lambda
Lösung ausblenden
TESTE DEIN WISSEN
Relationship between electric force, electric field, magnetic field, velocity, magnetic Lorentz force

What are the units for magnetic field
Lösung anzeigen
TESTE DEIN WISSEN
Electric force parallel to electric field

Lorentz Magnetic force perpendicular to magnetic field + velocity

Tesla, T
Lösung ausblenden
TESTE DEIN WISSEN
What is the Hall effect?

What equations are involved and how to derive the voltage/hall potential/EMF
Lösung anzeigen
TESTE DEIN WISSEN
• The magnetic and electric field applied to a current exerts forces on the wire. The magnetic field is perpendicular to the current flow/voltage. If forces are not even you get an uneven distribution of charge on one side of wire so need a new E field (as B field doesn’t change), to make net force=0 and charge flows straight

• Lorentz law F=q(E + V x B)
• Need to make net force =O so E=VB
• E=v/d
• I=NAVq
• Hall potential: V=Bvd where B is in y direction, v is in z and force F is in x
Lösung ausblenden
TESTE DEIN WISSEN

Copenhagen interpretation

Lösung anzeigen
TESTE DEIN WISSEN

a collection of views about the meaning of quantum mechanics principally attributed to Niels Bohr and Werner Heisenberg

Lösung ausblenden
TESTE DEIN WISSEN
Why should the thermal energy be higher than electrostatic interaction energy
Lösung anzeigen
TESTE DEIN WISSEN
Effective to keep the + and - ions together but not collapse into an ionic lattice
Lösung ausblenden
TESTE DEIN WISSEN
Unit for angular velocity and formulas
Lösung anzeigen
TESTE DEIN WISSEN
V=w x r
w=2piV
w=d theta/ dt

Lösung ausblenden
TESTE DEIN WISSEN
Conservation of momentum in inelastic collisions
Lösung anzeigen
TESTE DEIN WISSEN
• Means after colliding the particles stick together
• Initial momentum=final momentum
Lösung ausblenden
TESTE DEIN WISSEN
How KE equation can incorporate momentum
Lösung anzeigen
TESTE DEIN WISSEN
KE=1/2mv2=P^2/2m

By only using p=mv
Lösung ausblenden
TESTE DEIN WISSEN
When is AgI a conductor
Lösung anzeigen
TESTE DEIN WISSEN
Above a certain temperature Ag ions become mobile and I remain fixed
Lösung ausblenden
TESTE DEIN WISSEN
How to find drift velocity of a 1M solution of RbBr if the drift velocities are equal and opposite

Known cross sectional area of conductivity cell and current
Lösung anzeigen
TESTE DEIN WISSEN
I= sum NAVq
Then rearrange to get V
Lösung ausblenden
TESTE DEIN WISSEN
Equation for
• charge/current
• Force vector in electrodynamics
• Electric field (constant)
• Mobility of a species
Lösung anzeigen
TESTE DEIN WISSEN
Q=it, I=dQ/dt.

F=qE ie Lorentz force without magnetic field or using coulomb electric field/force equation
Since F=-dv/dx

Mobility: μ= |V/E|

Lösung ausblenden
TESTE DEIN WISSEN
What is work done?
Its equation?

What is potential energy?

What is power?
Lösung anzeigen
TESTE DEIN WISSEN
The distance moved in opposition to a force
W= -Fx or
W= |F||x|cos0
• if F and x are not parallel and have an angle 0 between them. Uses trig to make them parallel and resolves x
• Can integrate w with respect to dx

Potential energy: the potential of an object to do work
V=mgh (uses work done formula for an object moving vertically down)

Power:
Rate of doing work
P(t)= dW/dt
Lösung ausblenden
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Q:
How to find wavelength of an e- accelerated through a pd

Potential is known
A:
qV=1/2mv2
P=mv=h/lambda

Don’t want velocity so substitute and eliminate it to find lambda
Q:
Relationship between electric force, electric field, magnetic field, velocity, magnetic Lorentz force

What are the units for magnetic field
A:
Electric force parallel to electric field

Lorentz Magnetic force perpendicular to magnetic field + velocity

Tesla, T
Q:
What is the Hall effect?

What equations are involved and how to derive the voltage/hall potential/EMF
A:
• The magnetic and electric field applied to a current exerts forces on the wire. The magnetic field is perpendicular to the current flow/voltage. If forces are not even you get an uneven distribution of charge on one side of wire so need a new E field (as B field doesn’t change), to make net force=0 and charge flows straight

• Lorentz law F=q(E + V x B)
• Need to make net force =O so E=VB
• E=v/d
• I=NAVq
• Hall potential: V=Bvd where B is in y direction, v is in z and force F is in x
Q:

Copenhagen interpretation

A:

a collection of views about the meaning of quantum mechanics principally attributed to Niels Bohr and Werner Heisenberg

Q:
Why should the thermal energy be higher than electrostatic interaction energy
A:
Effective to keep the + and - ions together but not collapse into an ionic lattice
Q:
Unit for angular velocity and formulas
A:
V=w x r
w=2piV
w=d theta/ dt

Q:
Conservation of momentum in inelastic collisions
A:
• Means after colliding the particles stick together
• Initial momentum=final momentum
Q:
How KE equation can incorporate momentum
A:
KE=1/2mv2=P^2/2m

By only using p=mv
Q:
When is AgI a conductor
A:
Above a certain temperature Ag ions become mobile and I remain fixed
Q:
How to find drift velocity of a 1M solution of RbBr if the drift velocities are equal and opposite

Known cross sectional area of conductivity cell and current
A:
I= sum NAVq
Then rearrange to get V
Q:
Equation for
• charge/current
• Force vector in electrodynamics
• Electric field (constant)
• Mobility of a species
A:
Q=it, I=dQ/dt.

F=qE ie Lorentz force without magnetic field or using coulomb electric field/force equation
Since F=-dv/dx

Mobility: μ= |V/E|

Q:
What is work done?
Its equation?

What is potential energy?

What is power?
A:
The distance moved in opposition to a force
W= -Fx or
W= |F||x|cos0
• if F and x are not parallel and have an angle 0 between them. Uses trig to make them parallel and resolves x
• Can integrate w with respect to dx

Potential energy: the potential of an object to do work
V=mgh (uses work done formula for an object moving vertically down)

Power:
Rate of doing work
P(t)= dW/dt

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