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Lesson: Energy and Wavelength Chemistry

In this lesson, we will learn how to use the Planck constant and speed of light to convert between energies and wavelengths of electromagnetic waves.

Lesson Worksheet

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. Give your answer to 1 decimal place.