The figure at the right shows transitions between three states of a molecule (la

Question

The figure at the right shows transitions between three states of a molecule (labeled E_1, E_2, and E_3) that are observed through the emission and absorption of photons in a pair of experiments, A and B. Which transition is associated with the emission of the photon of the longest wavelength? a b c d e Which transition is associated with the absorption of the photon of the shortest wavelength? 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. This is because the molecules in the atmosphere of the star absorb some of the light emitted by the star. Which frequencies would you expect to be significantly blocked by passing through the cold gas? a. (E_2 E_1)/h b. (E_3 E_1)/h c. (E_3 E_2)/h d. None of them. a b c d

Explanation / Answer

1) we know that E = hc/lambda

Longer wavelength will corresspond to smaller energy difference. Photon is emmited when in higher to lower energy electron transition.

Option c is correct.

2) Absorption of photons happen in transitions from lower to higher energy states and short wavelength corresponds to high energy.

Option e is correct

3) The cold gas will absorb high energy photons. So its frequency is also higher. We know delta E = hf = hc/lambda

f = ( E3-E1) /h will be significantly blocked.

Option b

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