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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.

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.

Q3:

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

Calculate the energy per mole of the emitted photons. Give your answer to 1 decimal place.

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