I followed your steps perfectly up untill the last one. Why is it that the number of photons per min is given by joules per min / energy of single photon? can you plz explain that in apples and oranges terms lol.
Aside from that i have seen questions simmilar note that it says the answer is...
It is definitly B.
the electron gun consists of 3 parts.
1. the filament (im not entirely sure but i think it controls brightness via how many electrons are produced... but this is differernt to what helper said so im prolly wrong) *brightness*
2. the negative cap (this has a negative charge...
Ohh man thx heeps for that. I immediatly decided the sin and cos rule wern't gonna help because for some bad reason I assumed I was going to find a constant for DB.
Yea well done looks right to me 2.