when a light travels from rarer medium to denser medium it moves towards the normal. why it moves towards the normal? i wud like to know the perfect answer pls!!
protons are present in a nucleus. both have the same charge. do they repel? if not why?
2007-02-14 01:59:52 · 2 answers · asked by nandhini 2 in Science & Mathematics ➔ Physics
When light travels into a denser medium it is refracted. This is due to the components of the light being refracted slightly differently.
Part of the ray will start to be refracted before the other bit catches up - then it goes straight again through the media - remember light slows down when into denser media.
It will again be refracted back toward the normal on the way out of the material (by doing the opposite) - and speeding up again if going into a less dense medium.
Protons do repel each other in the Nucleus, but the Neutrons within the atom act as a type of shield keeping them a certain distance apart, so that the atom is 'bound' together.
The bigger atoms get (past Iron in the periodic table) start to become unstable (and the protons start to become a bit rowdy, the neutrons can't seperate them enough) this is why it is the bigger atoms that tend to be the most radioactive, as they want to lose there excess energy in one way or another - through alpha or beta or gamma decay.
2007-02-14 02:09:54 · answer #1 · answered by Doctor Q 6 · 1⤊ 0⤋
when light moves toward the the denser medium the particles of the medium doesn't allow the light to spread that's why the light bends towards the normal
protons in the nucleus repel each other but these forces of repulsion are overcome by the strong membrane of nucleus thus they remain in nucleus
2007-02-22 00:43:09 · answer #2 · answered by Anonymous · 0⤊ 0⤋