IB Physics SL Theme B: The particulate nature of matter questions

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Question 1

Paper 2Easy6 marks

Infrared radiation emitted by Earth’s surface reaches a carbon dioxide molecule in the atmosphere. Figure 1 shows two possible incoming infrared photons and two energy levels of the molecule. The molecule’s natural vibration frequency is $f_0$ In this model, a photon of frequency $f$ has energy $E=hf$

(a)

Using Figure 1, identify which photon can be absorbed by the molecule. Explain your choice using the resonance model and the energy levels.

[3]

(b)

As the molecule returns from $E_1$ to $E_0$ state the frequency of the infrared radiation emitted.

[1]

(c)

State the directions in which the radiation is emitted and explain how this can contribute to the greenhouse effect at Earth’s surface.

[2]

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