Recent content by a71cj34

Yup, we were supposed to Google it. Thanks to everyone who replied.

Wow, that is more simple than I thought xD! I'm going to ask my teacher tomorrow about what she expects for the mass of the electron- I suspect that we're just supposed to use a literature value. I think this question is pretty much solved, unless I'm supposed to actually calculate the mass of...

Ok, I understand. Thanks for laying it out like this. I wasn't taught that momentum equation but it looks very useful. When you say "given in tables" for the rest mass, can I ask what you mean? The way I see it, I have two possible answers: a literature value from online (but I'm pretty sure I'm...

I'm not entirely sure what this means. You lost me at the gamma and the series expansion. As I said, this is a Grade 12 Physics course, and I'm sorry, but I feel like this is getting a little too complex for my level. Is there any other way to solve the question without doing all of this? I get...

Alright, I'll do what you said. I'll assume the energy given is the rest energy. Thanks @jbriggs for the answer and everyone else who replied.

This is the original question: My calculation is: \begin{align*} E &= mc^2 \\ 4.96675 \cdot 10^{-19} &= m(299792458^2) \\ m &= 5.5256 \cdot 10^{-36} \end{align*}

I got 5.525 x 10^-36 kg: which is off of the literature value of 9.1 x 10^-31 kg. Is that difference reasonable? Why is the mass different in the first place? I'm not sure what's going on here. At this point, I'm thinking I'll just put that as my answer as this is a high-school course: I might...

Oh no, I'm talking about the electron's rest mass for the E = mc^2. About the photon, I found a small mention of it in my course notes: So I do think zero is the intended answer for the photon. Thanks.

Hmm, ok then. I'm just wondering because I don't remember learning this in my course. I'll take another look at the course notes. This looks like E = mc^2. Is that it? If so then my answer is correct.

I'm pretty sure the question is referring to rest mass. The question did not specify kinetic energy- just that it had energy. I'll have to look back at my course notes to see if the question is just bad writing or if zero is the intended answer for the photon. For the electron, I'll rephrase the...

Whoops, I meant energy. Wherever I say charge, I meant energy. Sorry for the confusion

I converted 3.1eV into J, substituted into E = mc^2. Since the energy is the same, I got the same answer for both: 5.52*10^-36 kg. This doesn't seem quite right- I doubt that a photon and an electron have the same mass. So, when two particles have the same charge, does that mean they have the...