Harder Physics Questions

[QuantumJG]

Heres a quantum-type question:

Through what angle must a 200keV photon be scattered by a free electron so that the photon loses 10% of its energy?

Ah, a Compton scattering problem!







let E' = 0.9E

[Edmund]

Heres a quantum-type question:

Through what angle must a 200keV photon be scattered by a free electron so that the photon loses 10% of its energy?

Ah, a Compton scattering problem!







let E' = 0.9E

Yeah I did exactly the same thing, did you have to convert the energy into Joules or something?

* Edmund bangs keyboard

[QuantumJG]

Heres a quantum-type question:

Through what angle must a 200keV photon be scattered by a free electron so that the photon loses 10% of its energy?

Ah, a Compton scattering problem!







let E' = 0.9E

Yeah I did exactly the same thing, did you have to convert the energy into Joules or something?

* Edmund bangs keyboard

Yeah you 'can' convert eV to J aslong as m_ec² is in the same units.

[Edmund]

Heres a quantum-type question:

Through what angle must a 200keV photon be scattered by a free electron so that the photon loses 10% of its energy?

Ah, a Compton scattering problem!







let E' = 0.9E

Yeah I did exactly the same thing, did you have to convert the energy into Joules or something?

* Edmund bangs keyboard

Yeah you 'can' convert eV to J aslong as m_ec² is in the same units.

I missed out the 'k' in 200keV

[Cthulhu]

QuantumJG is right.

[QuantumJG]

QuantumJG is right.

YAY!!!

[QuantumJG]

This is probably the best place to put my 900th post.

[appianway]

Good work! I was going to do the question and derive compton scattering from first principles, but I didn't end up having time.

If anyone feels like doing some relativity, use Lorenz transformations to derive the formulae for time and length dilation (without consulting any type of textbook/other internet page... they're probably very easy to find!).

If anyone feels like mechanics, here's a relatively straightforward question from the Resnick-Halliday book. A block is placed on the inside surface of the cone, and the cone is spun. Find the maximum and minimum frequencies of rotation of the cone so that the block does not move relative to the cone.

[Cthulhu]

I feel like Quantum Mechanics.

[Edmund]

How about something from the Electromagnetism field (no pun intended)?

[appianway]

OK.

A solenoid with a current i and n loops is placed on a ramp inclined at an angle theta to the horizontal. Consider the magnetic field of the earth and calculate the acceleration of the solenoid down the slope in respect to position.

(You'll need to introduce a few basic constants with the algebra)

Edit: To make life easier and to simplify the maths, presume that the solenoid can immediately roll without slipping.

[Cthulhu]

I've already done the Lorentz stuff last year why can't I look in my notebook? ;.; why do you hate me appianway? Is it my hair? I can change it!

[appianway]

Whoa who said anything about hating?

OK, I'll try to think of a quantum question. This one's quite straightforward, and it's qualitative, so I apologise for the fact that it's so simple.

How can a spectrum indicate the lifetime of a photon in an energy level?

I really need to think of something harder...

[polky]

mark_alec here:

I hope you mean the lifetime of a proton, not of a photon.

Something to research about Quantum Mechanics. An interpretation of observing the wavefunction of a particle is that the wave-function collapses, so if other observations are made immediately afterwards, the system will be in an identical state. If a radioactive nucleus is observed, can it ever decay?

[QuantumJG]

OK.

A solenoid with a current i and n loops is placed on a ramp inclined at an angle theta to the horizontal. Consider the magnetic field of the earth and calculate the acceleration of the solenoid down the slope in respect to position.

(You'll need to introduce a few basic constants with the algebra)

Edit: To make life easier and to simplify the maths, presume that the solenoid can immediately roll without slipping.

This sounds like a fun question, but I'll do it in the morning (I.e. 9am).

Btw: If my name stays on a thread, its because I'll just keep threads up that look interesting and look over them every oncewhile.