emission

  1. K

    contradiction about light absorption and emission

    "When light shines on an object, say a green leaf, it excites electrons on the atoms of the leaf to go to higher energy levels. As the electrons fall back to lower energy levels, the atoms of the leaf emit photons with the energy E = hv where h is Planck's constant and v is the frequency of the...
  2. D

    Spectral Line Emission due to Electrons Changing Energy Levels

    An unbound electron is captured into the n=3 energy level of the hydrogen atom. It subsequently goes to the ground state. What is observed? (Hint: E1 is the energy of the ground state) A.) One spectral line with Energy E1/9 B.) Two spectral emission lines with energies E1/9 and (E1/9-E1/4) C.)...
  3. A

    In Need of a Fluorescent Gas

    Hello Everyone, I am trying to find a substance that is in its gas phase between 21 and 37 degrees Celsius (70-100 degrees f) and between 10 and 200psi of pressure, that emits light in the visible spectrum when excited by a ultraviolet light source. Ideally the gas would also be colorless in...
  4. H

    emission spectra

    hi why does the hydrogen spectrum (or any other spectrum) consits of lines? i think that it does because its an emission spectra,energy is given off in the form of light and this light is record as a line colour. am not sure if i am correct. i dont think i word the answer properly either. can...