Recent content by Antti

No size does not matter, although I don't know about ridiculously large cages. There are big cages for sale and for example at CERN they routinely enclose big objects in tin foil or similar material. It's the quality of the seal that matters.

Thanks, that sort of makes sense. But he might say "well why doesn't the center return to its original state just once and only create one ripple?". Somehow I suspect energy conservation has something to do with it.

So I've studied physics at the university quite a bit and was a bit surprised when I couldn't answer this simple question a friend asked me. When something lands in water why are several ripples created? Like why is the resulting water wave made up of several peaks and valleys and not just one...

I've thought about dark matter and I'm wondering if it could possible be made up invisible bouond states of ordinary matter? Wikipedia says "According to consensus among cosmologists, dark matter is composed primarily of a new, not yet characterized, type of subatomic particle." But why a...

Homework Statement Plot the heat capacity as a function of temperature for aluminium, using the Einstein model. Homework Equations The Einstein model for heat capacity: The Attempt at a Solution The model assumes that the frequencies of all the harmonic oscillators in the material are...

Well no. Say I had a dumbbell made entirely of Copper and I knew the exact shape of the whole thing. Then I'm thinking there should be some torsion-spring effect, though small, in the middle bar when I apply a torque to one end. No materials are perfectly rigid. How do you calculate this from...

Im no expert on this, but I do know that aspheric lenses are used in high-end camera objectives http://en.wikipedia.org/wiki/Aspheric_lens But as you may know, no lens can be perfect for all wavelengths.

I just thought about a dumbbell (for some reason) and how one end rotates if I turn the other. If it was just a "mathematical system" with two flat cylinders and a long cylinder in between, then one end would rotate in exactly the same way as the other. But if the middle bar was rubber for...

But also cheap stuff ;) Everything's great when it's cheap...

My dad is an enthusiastic fisherman. He goes fly fishing almost every weekend of the year and of course I join him sometimes. Many things he and his friends say and believe about different lures, weather etc often sound like hasty conclusions. So I'm wondering if there are any scientific studies...

Personally I think Christmas should be replaced with "surprise day". An international commitee would each year come up with a new purpose, theme and execution of surprise day. This information will be released to the public exactly three days (this is very important) before commencing...

If you want any force in your swearing then try finnish :) I think the whole world needs to have the same language

I see. Well that obviously raises the question about how they got the answer in the book. I think you can understand that I'd rather trust the authors than you ;)

Okay, seems like my crappy first post is no longer editable... EDIT: fixed! :) Gokul: The book gives both the kinetic energy and velocity of the electron in the answer. I have only compared the first value since the velocity can't turn out right if the kinetic energy is wrong. So my answer...

This problem is straight from Haken & Wolf - The Physics Of Atoms And Quanta, 7th edition. It's problem 18.9 on page 336. If you happen to have the book that is. Problem text: The L_{I} absorption edge in tungsten is at 1.02 Å. Assume that a K_{\alpha} photon is "absorbed" by one of the 2s...