Q.35 Which of the following is(are) CORRECT?
(A) Light has wave nature only
(B) Light can have both wave and particle nature
(C) Photo electric effect shows that light can behave like particles
(D) Interference experiments show that light behaves like particles
Light exhibits wave-particle duality, behaving as both waves and particles depending on the experiment. Options (B) and (C) correctly describe this dual nature.
Option Analysis
(A) Light has wave nature only
This is incorrect. While light shows wave properties like interference and diffraction, it also demonstrates particle-like behavior in phenomena such as the photoelectric effect.
(B) Light can have both wave and particle nature
This is correct. Light’s dual nature, known as wave-particle duality, is a cornerstone of quantum mechanics, supported by various experiments.
(C) Photo electric effect shows that light can behave like particles
This is correct. In the photoelectric effect, light ejects electrons from a metal surface as discrete packets of energy called photons, proving its particle nature.
(D) Interference experiments show that light behaves like particles
This is incorrect. Interference, as seen in Young’s double-slit experiment, demonstrates wave properties through constructive and destructive patterns.
Wave-particle duality of light reveals its fascinating dual behavior, essential for CSIR NET life sciences and physics aspirants tackling photoelectric effect and interference questions. This concept, pivotal in quantum mechanics, shows light as both electromagnetic waves and photons.
Key Experiments
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Photoelectric Effect: Albert Einstein explained how light above a threshold frequency ejects electrons instantly, behaving as particle-like photons with energy E=hν.
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Interference Patterns: Young’s double-slit setup creates bright and dark fringes, confirming wave nature through superposition.
MCQ Insights for Exams
Correct choices (B) and (C) highlight duality—light isn’t limited to waves (ruling out A) or particles in interference (ruling out D).
