CBSE 2026 · Region 5 · Set 2 · Q28 · 3 marks
What are de Broglie waves? Show that the wavelength of the electromagnetic radiation is equal to the de Broglie wavelength of its quantum (photon).
Marking-scheme solution
Defining the de-Broglie wave.
Showing the wavelength of electromagnetic radiation equal to de-Broglie
\[\therefore \lambda_{\text {rad }}=\lambda_{p}
\]
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CBSE Class 12 Physics past-paper question from the 2026board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.