Virtual Labs

Quantum Nature of Light with Young’s Double-Slit Experiment

1. In the double-slit experiment with sand, the pattern observed on the screen consists of:

a: Interference fringes Explanation

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b: Diffraction rings Explanation

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c: Two separate piles Explanation

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d: A single central maximum Explanation

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2. The appearance of bright and dark fringes in the water-wave experiment is due to:

a: Reflection Explanation

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b: Refraction Explanation

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c: Interference of waves Explanation

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d: Polarization Explanation

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3. In the quantum double-slit experiment, an interference pattern is observed even when particles are released one at a time because:

a: Particles collide with each other Explanation

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b: Particles behave only as classical objects Explanation

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c: Each particle behaves as a wave of probability Explanation

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d: The detector amplifies intensity Explanation

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4. What happens to the interference pattern when a slit detector is turned ON in the quantum experiment?

a: Fringe width increases Explanation

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b: Interference becomes sharper Explanation

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c: Interference disappears Explanation

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d: Central maximum becomes brighter Explanation

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5. Which experiment best demonstrates the observer effect?

a: Sand through double slit Explanation

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b: Water wave interference Explanation

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c: Quantum particles without detector Explanation

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d: Quantum particles with detector Explanation

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6. In a double-slit experiment, the condition for destructive interference (dark fringe) is:

a: path difference = mλ Explanation

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b: path difference = (2m+1)λ/2 Explanation

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c: path difference = 2mλ Explanation

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d: path difference = mλ/2 Explanation

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7. What is the primary significance of Young's double-slit experiment?

a: It proves the particle nature of light Explanation

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b: It confirms the wave nature of light Explanation

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c: It measures the speed of light Explanation

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d: It explains the absorption of light Explanation

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8. When electrons are fired through a double slit one at a time WITHOUT a detector, the final accumulated pattern is:

a: Two bright spots like sand piles Explanation

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b: A random distribution with no order Explanation

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c: An interference fringe pattern Explanation

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d: A single central bright fringe Explanation

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9. Which concept explains why measuring which slit the electron passes through destroys the interference pattern?

a: Conservation of energy Explanation

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b: Wave function collapse / Observer effect Explanation

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c: Doppler effect Explanation

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d: Compton scattering Explanation

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10. What distinguishes quantum objects from classical particles in the double-slit experiment?

a: Classical particles always produce interference fringes Explanation

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b: Quantum objects always show two piles without a detector Explanation

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c: Quantum objects exhibit wave-particle duality, producing interference without a detector Explanation

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d: Classical particles produce only dark fringes Explanation

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