Recent content by Bruce Haawkins

Please do the maths before you speak the charged particle has not gotten an even amount of cancelling forces on it. The forces only cancel right at the center of the sphere.

Have a thick steel hollow sphere with a inside radius of 20 cm. Then fill it up with sulfuric acid and add water. Then remove the oxygen ions. then give the sphere a negative charge and all the hydrogen ions move to the surface of the inside sphere. then charge sphere positive and the hydrogen...

Thanks do you have a chapter on what range of wavelengths such a set of modes will absorb?

Can somebody please help me I am looking for the diameter required of a carbon nanotube to emit a wavelength of 800 nm. If I could just find a graph of nanotube diameter versus emitting wavelength.

What happens to the UV photons that strike the photovoltaic cell but do not take part in the photo electric efect, do thay reflect? apparently the best comercial solar cells are only 24% eficiant.

since the electron has a negative charge and the conductor has a neutral charge it makes sense to me that the electron will absorb. However if I had 10 electrons striking the conductor and a nano secound later five and the conductor was connected to the earth, will any of the electrons reflect

if a random electron strikes a neutral conductor does it get absorbed and increase the voltage of the conductor

Can anny body please help me find a formula to work out how much energy it takes to get 1 kg of lead to a given temprature from 0 Kelvin

ok them how do I work out how much energy it takes to get 1 kg of lead to a given temprature from 0 kelvin

<Moderator's note: Two threads merged. Please don't create multiple posts.> can anybody tell me how do I work out how much energy it takes to get an atom of say lead to a given temprature from 0 kelvin

Let me refrase my question how many photons at a wavelength of 1000 nm does it take to get a atom to a certan temprature.

Atoms contain electrons and when an electron is in an excited state it is due to it having taken on an photon. I will like to know how many such photons there are at a given temprature.

Can anny body tell me how do I find the average number of photons in an atom at a given temprature for say lead.

These days you get laser material that can absorb IR and emit a beam. My question is will the this laser behave the same as a conductor or will it convert some of the photon gas if it were in the box.Please can someone answer this question

So hyperleticaly speeking if all the photons were parallel and you had a lens that focused some of them, will the focused rays absorb and re-radiate