The figure at the right shows transitions between three states of a molecule (la
ID: 1512430 • Letter: T
Question
The figure at the right shows transitions between three states of a molecule (labeled E1, E2, and E3) that are observed through the emission and absorption of photons in a pair of experiments, A and B.
1. Which transition is associated with the emission of the photon of the longest wavelength?
a b c d e?
2. Which transition is associated with the absorption of the photon of the shortest wavelength?
a b c d e?
3. What might be a likely reason that there is no transition shown from E2 to E3 in situation B? (can have multiple answers)
a. The light is incident on a gas of the molecules and does not contain any light of the correct frequency.
b. The upward transition from E2 to E3 is forbidden by the laws of quantum physics.
c.The light is incident on a cold gas of the molecules and there are very few molecules in the state E2.
d. The author just forgot to draw it in.
4. If a cold gas of these molecules was in the atmosphere of a star that was emitting a continuous spectrum, you would expect to see some dark lines across the continuous spectrum from that star. Which frequencies would you expect to be significantly blocked by passing through the cold gas? (can have multiple answers)
a. (E2 E1)/h
b. (E3 E1)/h
c. (E3 E2)/h
d. None of them.
The figure at the right shows transitions between three states of a molecule (labeled E1, E2, and E3) that are observed through the emission and absorption of photons in a pair of experiments, A and B.
1. Which transition is associated with the emission of the photon of the longest wavelength?
a b c d e?
2. Which transition is associated with the absorption of the photon of the shortest wavelength?
a b c d e?
Explanation / Answer
1.
emission happens when electron jumps from higher to lower state
wavelength is longer when energy difference is least
Answer: c
2.
absorption happens when electron jumps from lower to higher state
wavelength is shorter when energy difference is more
Answer: e
3.
c.The light is incident on a cold gas of the molecules and there are very few molecules in the state E2.
a. The light is incident on a gas of the molecules and does not contain any light of the correct frequency.
4.
There is no transition between E2 and E3
so frequency will be
c. (E3 -E2)/h
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