An electron in the c level of a mercury atom
returns to the ground state. which photon
energy could not be emitted by the atom during
this process?
(1) 0.22 ev (3) 4.86 ev
(2) 4.64 ev (4) 5.43 ev

5.43 eV

Explanation:

from the energy level diagram, we can calculate the energy difference between c level and the ground state. the difference is 4.86 eV which is less than the 5.43 eV of choice 4. therefore, a photon of that energy cannot be emitted

as we probably am aware that our atmosphere or air have various levels, each level has different gasses, and each gas has another porousness. at the point when the light originates from lower porousness to higher penetrability, it alters its course. with the goal that implies that when the light originates from the moon to the earth, it alters it's course a lot more occasions. it essentially implies that the state of the light piece of the moon is changed on the earth.

not copied too! hope this !

joke:

h o h o hope you have a merry christmas!

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me