Someone help me with these questions about Italy?

Can someone help me out with this physics questions? They may be simple.?

• I need help with just this four from my 50+ question packet, they may be simple but I just can't think about it right now. Could someone help me out, I want to know the answer but I rather now why is it that way. I think they may be simple, but I don't know them !. The ground state energy level for He+ is -54.4eV. How much energy must the electron in the ground state of He+ absorb in order to be excited to the next higher energy level? a. 13.6eV b. 20.4eV c. 27.2eV d. 40.8eV e. 68.0eV I said [d] but I'm not sure why. 2. Negative charges are accelerated by electric fields toward points a. at lower electric potential b. at higher electric potential c. where the electric field is zero d. where the electric field is weaker e. where the electric field is stronger I said [b] but again I'm not sure why, I don't usually think about this I just think of it as +/- charges. 3. Both an incandescent light bulb and fluorescent tube are rated for 40 watts. Which puts out most light? a. the light bulb. b. the fluorescent tube c. both are equally bright. I said [b], am I right? can someone explain why either one would be brighter, if any? 4 This question is followed by this one: Vega is a blue star. Antares is a red star, Which is hotter? a. Vega b. Antares I said [a] which is the right answer and I know why but this is my other question: I see a neon sign over the corner tavern. Is the neon in the sign as hot as Antares? a. Yes b. No I said [b] but I think I'm wrong, what is the reason it would either "yes" or "no" please help me out, I just need this 4, but apart from knowing the answer I want to mostly know why.

• Answer:

  (4) Vega is hotter. Blue > White > Yellow > Orange > Red stars. http://books.google.com/books?id=mfJeWrJRqrkC&pg=PA5&lpg=PA5&dq=Vega+++Antares+hotter&source=bl&ots=zlVJStzqs_&sig=oZOHKYZu5VkPEvB8pmuDsi0TAbY&hl=en&sa=X&ei=dgZ5T-z4IqjO2gXmv_22Bg&ved=0CFcQ6AEwBw#v=onepage&q=Vega%20%20%20Antares%20hotter&f=false