Question

A material kept at high temperature is seen to emit photons with energies of 0.3 eV, 0.5eV, 0.8 eV, 2.0 eV, 2.5 eV, and 2.8 eV. These are the only photon energies observed. It is now cooled down to a very low temperature so that it is not emitting photons anymore. If a beam of light with a continuous range of energies from 0.01 eV to 10 eV shines on the material, what photon energies in this beam will correspond to dark absorption lines?

1. 0.3 eV, 0.5 eV, 2.8 eV


2. 0.3 eV, 0.5 eV, 0.8 eV


3. 0.3 eV, 0.8 eV, 2.8 eV


4. 0.8 eV, 2.0 eV, 2.8 eV


5. 0.5 eV, 0.8 eV, 2.8 eV


6. 0.3 eV, 2.5 eV, 2.8 eV

Answer 1

the correct one is 2

Step-by-step explanation:

The emission and arcion spectra are similar, in the emission spectra a heated material emits photons for the internal transitions of the electrons, in the absorption spectrum the continuous emission of a lamp is absorbed at the energies that the material has transitions.

In our case the material is low early, so all the electrons are in their base states.

As the light beam has all wavelengths, those corresponding to the first emission of the material will be observed.

When reviewing the answers, the correct one is 2