Question

1. order the principal energy levels 1, 2, 3, 4 from lowest to highest energy. * 4 points then select the correct statement about how light is formed. a. 1 < 2 < 3 < 4; light forms when electrons absorb photons b. 1 < 2 < 3 < 4; light forms when electrons fall to lower levels c. 4 < 3 < 2 < 1; light forms when electrons fall to higher levels d. 1 < 3 < 2 < 4; light forms when electrons are annihilated

Explanation:

Step1: Recall energy - level order

The principal energy levels are ordered as \(1<2<3<4\) where level 1 is closest to the nucleus and has the lowest energy, and higher - numbered levels have higher energy.

Step2: Recall light - formation mechanism

Light is formed when electrons transition from higher energy levels to lower energy levels. As the electron falls to a lower level, it emits a photon of light with energy equal to the energy difference between the two levels.

Answer:

B. 1 < 2 < 3 < 4; light forms when electrons fall to lower levels