17
QuizMultiple Choice

The Modern Atomic Theory

Question 17 • *26-27 CFISD TX-Chemistry A CR

The Bohr model of the atom explained why emission spectra are discrete. It could also be used to explain the photoelectric effect. Which is a correct explanation of the photoelectric effect according to the model?

Answer
A
Electrons are emitted with more speed when brighter light strikes them.
B
Electrons need small amounts of energy to be released from an atom.
C
Electrons move between levels only if they are hit by the right frequency of light.
D
Electrons need specific amounts of energy to jump levels and be emitted.

Explanation

In the Bohr model, electrons occupy specific energy levels, so they must absorb a specific amount of energy to move to another level. To be emitted, an electron must absorb enough energy to reach beyond the atom’s bound levels and escape. Thus, electrons need specific amounts of energy to jump levels and be emitted; brighter light alone does not guarantee emission.

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