Recent content by Yael

Hi, i'm stuck on my homework.. and this particle physics and cosmology chapter is killing me a question asks me to discuss the following conservation laws: energy, linear momentum, angular momentum, electric charge (ok so far) AND bayron number, lepton number and strangeness. are all of...

Hi, i have a question... compute the shortest wavelength in each of these hydrogen spectral series: Lyman, Balmer, Paschen, and Brackett. (which i managed...) my problem is with the second part of the question : compute the energy in electron volts of the highest energy photon produced in...

hi, i have a question... i was asked to compute the shortest wavelength in each of these hydrogen spectral series: Lyman, Balmer, Paschen and Bracket - which i did... in the second part i need to compute the energy (in electron volts) of the highest energy photon produced in each series...

a question asks if the Bohr model contredicts in any way classical physics. i replied that only the first assumption that the electrons are fixed in circular orbits violates the laws of classical mechanics - of the idea of centripetal acceleration (?) am i right to say that? did i miss...

oh good thanks :) another verification if you don't mind the question asks if the Bohr model contredicts in any way classical physics. i replied that only the first assumption that the electrons are fixed in circular orbits violates the laws of classical mechanics - of the idea of...

oops sorry ! well I've replied that the light constitute only a few colours because neon emits strongly in the red - orange region mercury in ultra violet and so on. each element corresponds to different wavelengths. though I'm not sure. i guess mainly because I'm not too sure what the...

need to hand in an assingment in an hour. would appreciate help on this : "Does the light emitted by a neon sign constitute a continuous spectrum or only a few colors? Defend your answer" thank you

i have another question :-/ i solved it but not too sure. "A hydrogen atom is in its fifth excited state, with principal quantum 6. The atom emits a photon with a wavelength of 1090 nm. Determine the maximum possible orbital angular momentum of the electron after emission." so i basically...

Got it ! Thanks very Much Hootenanny :-)

getting into atomic physics I'm trying to answer this question but can't seem to understand exactly what they mean by it : "Does the light emitted by a neon sign constitute a continuous spectrum or only a few colors? Defend your answer"

so... 1. at first stage i use the classic expression of kinetic energy (½ mv²) with the 54 ev electron to find the velocity 2. after i obtain V i turn to de broglie to find the wavelength. 3. with the wavelength - i use bragg's law (2dsinθ = mλ) to get to 'd'. 4. use d to get 'a' through: d...

oh i was looking at the link that Doc Al posted : http://hyperphysics.phy-astr.gsu.edu...davger.html#c1 to be honest I'm all mixed up with how to get to the "a" :-S i can't seem to get how gulson got: a cos θ = d

From what I've understood so far : a = d sin θ (?) Thanks for all the help so far everyone.

on the same subject - the expression for diffraction is : 2dsinTheta = m times lamda. where d is the spacing between the horizontal lines and not the vertical ones :-/ how do i get to "a" ?

when using the kinetic energy to find V... do i use the expression for relativistic kinetic energy where v/c approaches 1? or do i simply use the classical expression of 1/2 mv squared? i know this is basic but... :-S thanks !