Question

when elements are heated to high temperatures some of their electrons are excited to higher energy levels. these excited electrons can then fall back to lower energy levels, releasing the excess energy in packages of light called photos, or light quanta. this is illustrated below. when is light energy released?

Explanation:

When elements are heated, electrons get excited to higher energy levels. When these excited electrons fall back to lower energy levels, they release the excess energy as light energy in the form of photons.

Answer:

When excited electrons move back to lower energy levels.