Question

first i was thought that when electromagnetic radiation hits an electron then it shows photoelectric effect and thus electron leaves the atom. but then i was thought that when electromagnetic radiation hits electron then it goes into excited state and goes into upper shell. I'm confused. what exactly happens when electromagnetic radiation hits electron?​

Answer 1

Answer:

hii

dear how are you

which class ??

age ??

Answer 2

Answer:

First of all photoelectric effect is a completely different phenomenon than hydrogen like species , or bohr's concept of atom . In photoelectric experiment electromagnetic radiation is made to strike the target metal ,for example caesium, usually these metal already have free electrons in their valence state so practically none of the energy of the electromagnetic radiation goes into exciting the electron from ground state , now the attraction between the electron sea and metal kernels or in other words the metallic bond between the electron and the metal is accounted for using the metals work function which completely depends on the metal itself , it is also a surface phenomenon, so the electron needs only that much energy from the em radiation that It'll beat the work function of the metal and release from the metals surface now on the way of receiving energy and being free it may lose some of the energy received by the electromagnetic radiation because of collisions with other electron on the metal surface hence finally its Kinetic energy is between E-ϕ and 0

In the latter context of excitation of electrons in orbits we must strictly talk about bohr's concept ,

So in bohr's model of atom if electromagnetic radiation is made to strike an electron then it may excite to a higher energy orbit depending on the electromagnetic radiations energy , if sufficient energy is provided then the electron may completely separate from the atom , this energy is the binding energy of the electron in that specific orbit , in the experiment to obtain the absorption spectrum of hydrogen the electromagnetic radiation(light) was directly used to excite electrons of hydrogen gas sample