IB Physics SL E.1.5 Photon Energy

Practise calculating photon energy from frequency or wavelength, converting electronvolts and joules and using photon number or power to analyse radiation and atomic transitions.

Exam points

calculate E = hf or hc/λ with wavelength in metres and frequency in hertz
convert between joules and electronvolts before comparing photon energy with a level difference
find photon rate from power divided by energy per photon and preserve significant figures

[Maximum number: 1]

This question is about energy level transitions.

Some of the electron energy levels for a hydrogen atom are shown.

Figure for Question E.1.5—Photon energy question 1 — IB Physics SL

A hydrogen atom is excited to the -1.51 eV level.

State the energy in eV of the maximum wavelength photon emitted as the hydrogen atom returns to the ground state.

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E.1.5—Photon energy question 1