Recent content by siifuthun

I need a refresher on calculus need to derive this equation, the question is: A --> B --> C and where decay constants: http://img183.imageshack.us/img183/4403/aki2.jpg Derive an expression for the activity of B as a function of time. So what I'm having trouble with is changing the...

I see what you mean now, although now I feel bad since I went ahead and listed 64 cases. At least now I can shorten my answer. Thanks a lot, this cleared up the bit about the zero.

I think I'm on the right track for this problem, but I'm not entirely sure. Find the solutions to the one-dimensional infinite square well when the potential extends from -a/2 to +a/2 instead of 0 to +a. Is the potential invariant with respect to parity? Are the wave functions? Discuss the...

energy values of a "half" harmonic oscillator This is the full question: Find the solution to the "half" harmonic oscillator: http://img241.imageshack.us/img241/9181/02bt7.jpg Compare the energy values and wave functions with those of the full harmonic oscillator. Why are some of the full...

This is the question: For a particle in a three-dimensional box of sides a, b, and c, where a does not equal b and b=c, make a table of n_x, n_y, and n_z, the energies, and the degeneracies of the levels in which the quantum numbers range from 0 to 4 (Take ((a^2)/(b^2)) = 2). Ok, I think I...

Think about the type of 15 numbers you can use to add up to 24. If you wanted to use the lowest numbers possible for all 15 numbers, how many times would the number one have to be used?

So, since B is infinite (and it should be if A is, correct?), then it should have the same cardinality as A - and we know the cardinality of A because it's countable, meaning that B would be countable in that case?

That's a good point. In that case it would be countable. So I guess in that case the answer is false, seeing that B can be countable or uncountable. Thanks.

If A is the set containing natural numbers, and B is the set containing real numbers, then B would have to be uncountable right?

This is the question, and we're supposed to answer if it's true or false: If A is a countably infinite set, and A is a proper subset of another set B, then B is uncountable. I thought this was false, because if A is infinite and countable, then B should also be infinite and countable in...

:biggrin: Thank you for helping me sort that out in my head, I think I was onto the right idea but that I was just confused, this really clarified it for me.

I'm still a bit confused as to what "potential" referers to when we're talking about electricity and magenetism, and I'm not quite sure how it's related to potential energy if it is. If anyone can offer a bit of clarification or just a place that offers a good definition (b/c my book sure...

Hmm, I don't know, I was a bit confused as to what the professor was asking, he made up this problem and didn't check for any errors before posting it as a practice for the midterm. We're going to go over in discussion today, so maybe that'll help.

A vertical screen has two narrow slits separated by distance d. A second screen, parallel to the first, is a distance L away (L>>d) and displays the first minimum of the two slit interference pattern a height h above the horizontal line drawn from the center of the slits to the second...

A telescope has an objective mirror of 6m. An astronomer uses it to determine if a certain object is a binary star, i.e. two stars in orbit around a common point. If the object is 25 light years away (a light year is the distance light travels in one year) what is the minimum separation of...