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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

Unit: Rad s-1

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

E=v/d (potential gradient)

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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