Explain why increasing the frequency of electromagnetic radiation increases the energy transferred when it is absorbed by a material.

Eduqas GCSE Physics — 6.2 Interactions of electromagnetic radiation with matter · Explain · 4 marks · View as Markdown

Written & reviewed by James Millett — Biology (Imperial College London), PGCE Science (University of Cambridge).

Scientists use different types of electromagnetic radiation to study materials. The effect on a material depends on the frequency of the radiation used.

Model answer (4 marks)

Each photon carries a discrete amount of energy given by E=hf. The energy of a photon increases linearly with its frequency (f). When a photon is absorbed, its energy is transferred to the material. Therefore a higher‑frequency photon transfers more energy to the material per absorption event.

Examiner tips

Use the equation E=hf to link frequency and energy
Explain that absorption transfers the photon’s energy to the material
Show the logical chain: higher f → higher E → more energy transferred
Keep answer concise and use correct terminology

Common mistakes

Saying ‘higher frequency means more photons’ – it is the energy per photon that changes
Using the wrong formula (e.g., E=hc/λ) without recognising λ is inversely related to f
Failing to mention that energy is transferred only when the photon is absorbed

Mark scheme (4 marks)

Each photon carries a discrete (fixed/packet) amount of energy
The energy of a photon increases as frequency increases
When a photon is absorbed its energy is transferred to the material
So a higher-frequency photon transfers more energy to the material per absorption event

Key terms in this question

frequency · absorbed · energy

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