Recent content by DoubleHelix

Wait I think I understand this thing now, the neutral Z can decay into a neutrino anti-neutrino pair so it will contribute to the overall rate of the neutral Z interactions meaning that it must increase the resonance width. So if you measure the total width and then the partial width of each...

Sorry for resurrecting this old thread, but going back to something that was mentioned earlier (much much earlier), why is the resonance width of the neutral Z boson sensitive to the number of light neutrinos? I've been looking for the answer to this for ages!

Thanks guys, that makes sense.

I'm asked to examine a set of processes and determine if they are possible/impossible according to the Standard Model. So I have to check that energy, baryon number, color, lepton number, quark flavor and the symmetries are conserved. I'm fine with all of these but how do you go about checking...

Out of interest, how would one go about solving the third part of this question?

OK so I had a go at using the method you told me and, I did: \frac{C_p}{C_v} = \frac{C_v + R}{C_v} = \frac{\frac{1}{n}(\frac{dU}{dT}) + R}{\frac{1}{n}(\frac{dU}{dT})} And assumed (for now) that it is a monatomic gas to calculate a set of U values which I plotted against the T values and...

After reading your reply I read through the question again and noticed that it mentions the the gas is undergoing adiabatic expansion in a later part of the question, I never read this far into the question before so I didn't realize. Would the relation you mentioned hold true for an adiabatic...

Hi, my task is to calculate the ratio (gamma) between the specific heats of a gas (Cp and Cv). The only information I have is a table of data for the pressures and volumes of the gas at different temperatures. I don't know if its monatomic, diatomic etc. (it's a later task to determine this)...

Ah thanks so much! I assumed I'd be using the Sun as it is called a solar cell but yes it makes more sense to use a light bulb so I know the power of it, it'd be difficult finding the power of the Sun that reaches the surface with all that atmosphere and stuff in the way. I guess I was being...

Part of my Physics Planning paper says this: "You are to design laboratory experiments to compare the energy conversion rates of the two systems (one using photons to release electrons in a solar cell and one using a solar panel to heat water), in order to find out which is the more efficient...

Hi, what voltage would need to be used to detect a small current (detectable by a microammeter) through an insulator like paper?

Sorry for my very late reply, and yes it was supposed to be battery. You did help a lot. And just in case anybody else is struggling with a problem like this then I'll explain how I did it. I worked out that I could solve the equations simultaneously to find find the internal resistance of the...

Homework Statement The p.d. across a battery's terminals is 8.0V when connected to a 4ohm resistor. When this resistor is replaced with a 2ohm resistor the p.d. across it's terminals is 6.0V. What is the emf and internal resistance of the resistor?Homework Equations V=IRThe Attempt at a...

Ah yes, so I need to calculate the volume of the bottle. I found the volume of the bottle to be 0.02 and thus got the density to be = 24.0 / 0.02 = 1200kg m^3. Could you please clarify that i have done this correctly?

Hi, here's my problem: The balance of a bottle when empty is 70.0g, when full of water is 90.0g and when full of another liquid is 94.0g. The density of water is 1000km/m(to the power of 3), what is the density of the toher liquid? I know that density = mass / volume so i think that i...