An atom in its ground state is excited when it absorbs a single photon of light. The atom then relaxes back to the ground state by emitting two photons, the first, an orange photon at 600 600 nm, and the second, an infrared photon at 1200 1200 nm. What is the wavelength of the absorbed photon

400nm

Explanation:

Energy of a photon is inversely proportional to it's wavelength

  -(1)

Since the energy of the absorbed photon () is equal to the sum of energies emitted ()

Using the relation of and ,

може ли да зареждате повече информация, моля

answer: atomic mass was originally used to arrange elements on the periodic table, but is no longer used to organize the modern version.

explanation:

originally atomic mass was used to arrange elements on the periodic table from left to right in a row. each column then shows similar properties of elements of a group.

in modern periodic table, the atoms are arranged in increasing atomic number. as atomic number represents the number of protons in an atom which is unique for every atom.