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Ohh right I get it now. Thx alot for explaining that like you did. Its much appreciated.

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.

I had few problems up untill this question, and it totally threw me how do you do it?