Chapter 11: Dual Nature of Radiation and Matter - Assertion-Reason Quiz

Assertion (A): Caesium emits photoelectrons even when illuminated by yellow light. Reason (R): The work function of caesium is 2.14 eV and the photon energy of yellow light (frequency ~5.2 × 10¹⁴ Hz) is approximately 2.15 eV, which just exceeds the work function.

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