Lesson Worksheet: Energy and Wavelength Chemistry

In this worksheet, we will practice using the Planck constant and speed of light to convert between energies and wavelengths of electromagnetic waves.

Q1:

Heated thallium ions emit photons with an energy of 8.644×10 J.

Calculate the wavelength of the emitted photons.

Calculate the energy per mole of emitted photons.

Q2:

Heated barium ions emit photons with an energy of 2.722 eV.

Calculate the wavelength of the emitted photons.

Calculate the energy per mole of emitted photons.

Q3:

In a flame test, bismuth atoms emit photons with an energy of 4.042 eV.

Calculate the wavelength of the emitted photons.

Calculate the energy per mole of the emitted photons.

Q4:

Mercury atoms in a high-pressure lamp emit photons with an energy of 6.705 eV.

Calculate the wavelength of the emitted photons.

Calculate the energy per mole of emitted photons.

Q5:

The atomic emission spectrum of nitrogen contains a strong line corresponding to photons with an energy of 1.656×10 J.

Calculate the wavelength of the emitted photons. Give your answer to 1 decimal place.

Calculate the energy per mole of emitted photons.

Q6:

Chlorophyll a strongly absorbs light with a wavelength of 680 nm. What is the energy of a photon of this light?

  • A3.92×10 J
  • B9.58×10 J
  • C2.92×10 J
  • D6.77×10 J
  • E5.15×10 J

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