AP Chemistry 3.12.A: Properties of Photons

Explore AP Chemistry 3.12.A questions on calculating photon energy, wavelength and frequency and relating absorption or emission to electronic transitions.

Exam points

Explain how reaction rates and mechanisms depend on elementary steps, collisions and activation energy.
Apply rate laws and experimental concentration data to infer reaction mechanisms and rate constants.

[Maximum number: 1]

Answer the following questions about the element Si and some of its compounds.

A single photon with a wavelength of $4.00 \times 10^{-7} \mathrm{~m}$ is absorbed by the Si sample. Calculate the energy of the photon in joules.

For the correct calculated value: 1 point

E=h v=h\left(\frac{c}{\lambda}\right)=6.626 \times 10^{-34} \mathrm{~J} \cdot \mathrm{~s}\left(\frac{2.998 \times 10^{8} \mathrm{~m} \mathrm{~s}^{-1}}{4.00 \times 10^{-7} \mathrm{~m}}\right)=4.97 \times 10^{-19} \mathrm{~J}

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3.12.A—Explain the properties of an absorbed or emitted photon in relationship to an electronic transition in an atom… question 1