calculate the wavelength,wave number and frequency of photon having an energy equal to three electron volts?

Question

anonymous · Answer

@chmvijay

frostbite · Answer

Planck's relation for the energy of 1 photon:
$$\large E _{photon}=h ~ f = \frac{ h ~ c }{ \lambda }$$
$$\large E _{photon}= 3 E _{electron}$$
What the question is:
what is $E_{electron}$?

anonymous · Answer

thnx brother!

frostbite · Answer

Well we can't answer the question yet... thinking about how we find $E_{electron}$ :)

frostbite · Answer

@hamza10 you don't have anymore information? like a number for the electron energy?

anonymous · Answer

i jus have the value of H which is a constant

chmvijay · Answer

yaaa thinking:)

chmvijay · Answer

is that correlation of Einstein equation and this equation? @Frostbite

chmvijay · Answer

not only mc^2 it should be 3mc2 right sine three electrons are there

anonymous · Answer

@chmvijay  m still confused can u make it clear to me?

chmvijay · Answer

but iam not sure on this

chmvijay · Answer

how much wavelength we will get the answer when we calculate by this formula have u done

chmvijay · Answer

LOL

chmvijay · Answer

ok leave it LOL

frostbite · Answer

lol we need the information about what energy the electrons should process. I doubt that he got all information.

preetha · Answer

You know h.  Photons travel at the speed of light, so you know c. all you have to do is to put in 3 and solve for wavelength.  What am I missing?

anonymous · Answer

sorry i got a change in the question can u make it now?

anonymous · Answer

@chmvijay @Frostbite @Preetha

chmvijay · Answer

energy equal to three electrons i dont think its so simple

anonymous · Answer

we need also to find the wave number nd frequency?

chmvijay · Answer

still confusing man :P

anonymous · Answer

me 2 :(

chmvijay · Answer

common smile man u will get it soon :)

anonymous · Answer

yeah!

chmvijay · Answer

LOL

chmvijay · Answer

its eV

anonymous · Answer

yeah! it was a mistake now i have solved the question @chmvijay

chmvijay · Answer

good :) next time please don't make mistake OK :)

anonymous · Answer

yeah! i thought i put everyone in trouble due to this mistake :P

chmvijay · Answer

no problem but at least we thought how we can tackle this ? anyway it was not a tall problem ;)

anonymous · Answer

yeahh!

frostbite · Answer

@Preetha 
The problem at the time was that the energy of the electron was unknown. So two unknown with 1 equation.

anonymous · Answer

@Frostbite  i have done it

frostbite · Answer

I know, just saying why me and chmvijay were having some hardships with the problem. As it wasn't 3 electrons but 3 electron volts :P