1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Exam revision help

  1. Jun 19, 2003 #1
    this was a question in a prevoius year exam that im 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
     
  2. jcsd
  3. Jun 19, 2003 #2

    FZ+

    User Avatar

    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
     
    Last edited: Jun 19, 2003
  4. Jun 19, 2003 #3
    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.
     
  5. Jun 19, 2003 #4
    1 eV = 1.6x10^-19 Joules

    Convert it to Jays.
     
  6. Jun 19, 2003 #5
    thank you very much
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Exam revision help
  1. Exam help (Replies: 9)

Loading...