Calculate the energy and wavelength of the photon

[shezill]

this was a question in a prevoius year exam that I am really stuck on.

An atom has an energy level 1.8 eV above ground state. When excited, it returns to the ground state and emits a photon. Ccalculate the energy and wavelength of the photon.

help me please
thank you

 

[FZ+]

Doesn't seem very difficult...

Energy of photon = energy lost by electron as it goes down the energy level.

Also, E = hf = h*c/l

Plug in the numbers...

And don't forget that 1 eV = 1.6 * 10^-19 J

 

[shezill]

but what numbers do i plug in. Do i have to use a fomula on the 1.8eV first to get the numbers or just use that.

 

[frankR]

Originally posted by shezill
but what numbers do i plug in. Do i have to use a fomula on the 1.8eV first to get the numbers or just use that.

1 eV = 1.6x10^-19 Joules

Convert it to Jays.

 

[shezill]

thank you very much