Recent content by Frigorifico

I mean that the power supply has a built in resistance of 50 Ohms for anything you connect to it

I measured the spectrum of the LED, it was 358.6 instead of 370 nm

The LED had a resistance of 50 Ohms, so the current would be just Voltage/50. If current is proportional to voltage, the LED output would be proportional too, right?. I think this is what I'm struggling the most to understand. My understanding is that photodiodes will absorb a bunch of...

My setup: I have the an LED (LED370E) in front of a photodiode (S12915-16R). The photodiode is connected to an ADC (DT5751) which has a counting functionality. The way it works is that it counts how many times the signal goes above a certain threshold and makes a histogram out of it. I know...

they differ in the fact that he wants me to use that one equation to get the number of photons, but my understanding is that only works if we were counting individual photons, which we weren't

I agree the distribution is poissonian, the problem is that I don't see how can I go from the ADC units to photons with his method

Hello, I'm working on a scintillation device to detect protons, I have a disagreement with one professor and I would like your opinion. There is one photodiode model we want to use to measure the light intensity from the scintillators, and we want to relate the signal of that photodiode with...

If I have a beam of protons that go into a block of water, how can I know how many photons will be produced along the beam path?. I'm assuming all the photons have the same energy. I know that the energy deposition will follow a Bragg Curve, and I think that energy deposition is probably...

Then I just want to understand, if I have a spin 0 massive particle and it decays into 2 RH particles, how does that conserve momentum?, what calculation can I make?

When learning about chirality I was very surprised to find that for QED and QCD the decay modes that would produce 2 particles with the same chirality had a Matrix Element of 0, which I took to mean that angular momentum was being conserved. Even the W only decay into RH antiparticles and LH...

If everything goes right I am in my last year of my physics program in my university. I want to do research, I did a short internship at CERN and I would like to work there, and I know that for that I need to get a masters or a phd. The thing is that I am not sure to which university should I...

Thanks. I wanted there to be a reason for some values to be constant, but I guess we still don't know the reason for the constants to exist nor they proportion to one another

I learned in Analytical Mechanics: "Emmy Noether's theorem shows that every conserved quantity is due to a symmetry". The examples I learned where conservation of energy as symmetry in time and conservation of momentum as symmetries in space. Now I wonder, do universal constants are also due to...

Hello. I am a physics student and recently I have not done so well. This is one of those times when even your best effort isn't enough. I have had those before and have come through, I know I can, I just don't believe it right now,. And I really love this dang, I really do, that's why I am so...

The way I see it is that sometimes, when something doesn't make sense, it may be because we are trying to see that phenomenon as something independent, while it isn't and can't be independent, and if you see a wider picture, in this case the proceses needed to set up it all, everything makes sense