# 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 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 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?

- A J
- B J
- C J
- D J
- E J