The phenomenon of interference of light demonstrates that light has: MCQ with Answer and Explanation

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The phenomenon of interference of light demonstrates that light has:

A. Wave nature

B. Particle nature

C. Both particle and wave nature

D. Neither

Answer: Option A

Solution (By JKSSB Mock Tests)

Interference (constructive/destructive superposition) is a characteristic wave phenomenon, requiring coherent sources and path difference. Young's double-slit experiment demonstrated light interference, confirming its wave nature. Particle nature is shown by photoelectric effect. Memory aid: 'Interference/diffraction ⇒ wave nature; photoelectric effect ⇒ particle nature'. This conceptual question tests wave-particle duality fundamentals, frequently examined in competitive exams. Always link specific phenomena to the aspect of light they demonstrate; competitive exams often combine both aspects in advanced questions.

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Question #1

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The half-life of a substance is 2 years. After 6 years, what fraction of original substance remains?

A. 1/4

B. 1/16

C. 1/8

D. 1/2

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Correct Answer: Option C

Explanation:
3 half-lives => 1/8.

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Question #2

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Prism minimum deviation depends on:

A. Wavelength only

B. Prism angle only

C. Refractive index only

D. Both angle and n

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Correct Answer: Option D

Explanation:
Formula: n = sin[(A+δ_m)/2]/sin(A/2). δ_m depends on prism angle A and refractive index n. Memory tip: 'δ_m increases with A and n; used to measure n'. Optics formula frequently tested in competitive exams.

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Question #3

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Which of the following materials is diamagnetic in nature?

A. Aluminum

B. Iron

C. Water

D. Nickel

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Correct Answer: Option C

Explanation:
Materials are classified by their magnetic properties. Ferromagnetic materials (Iron, Cobalt, Nickel) are strongly attracted to magnets. Paramagnetic materials (Aluminum, Platinum) are weakly attracted. Diamagnetic materials (Water, Bismuth, Copper, Gold) are actually weakly repelled by a magnetic field because they create an induced magnetic field in opposition to the externally applied one.

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