Kit Library / Science / Applied Physics & Quantum Mechanics

⚡ Topic Learning Kit

Quantum Mechanics

English 19 leveled MCQs 17 flashcards 7 games Free

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💡 Key Idea

The Core Discovery

Matter waves confirmed experimentally.

The Davisson-Germer experiment (1927) provided the first experimental confirmation of de Broglie's hypothesis that matter exhibits wave-like behavior. By scattering electrons off a nickel crystal, they observed a diffraction pattern, which is a wave phenomenon. This proved that el...

↳ Electrons diffract like waves, proving matter has wave nature.

🕰️ Timeline

Historical Context

From hypothesis to experiment.

↳ The experiment was a pivotal step in quantum mechanics.

⚙️ Process

Experimental Setup

How the experiment was done.

↳ Electrons scattered off a crystal produce an interference pattern.

📖 Smart notes

What you'll study, topic by topic

1

Davisson-Germer Experiment: Wave Nature of Matter

The Davisson-Germer experiment confirmed the wave nature of electrons by observing diffraction patterns from a nickel crystal. The measured wavelength matched de Broglie's prediction, providing direct evidence for matter...

  • The experiment confirmed de Broglie's hypothesis that matter exhibits wave-like behavior.
  • Electrons were scattered off a nickel crystal, producing a diffraction pattern.
  • The observed wavelength matched the de Broglie wavelength calculated from the accelerating voltage.

~8 min · full explanation, examples & memory tricks in the app

❓ Leveled MCQ practice

Try the smart MCQs from this kit

19 questions laddered from warm-up to topper-level, each with an explanation. A taste:

What did the Davisson-Germer experiment conclusively demonstrate?

Beginner
A Light is purely a particle B Atoms are indivisible C Particles have no wave nature D Electrons exhibit wave nature
Show answer & explanation

Electrons exhibit wave nature

The experiment showed diffraction of electrons, confirming de Broglie's hypothesis of wave-particle duality.

In the Davisson-Germer experiment, electrons were scattered off a crystal of:

Beginner
A Copper B Nickel C Silicon D Graphite
Show answer & explanation

Nickel

Davisson and Germer used a nickel crystal to observe diffraction patterns.

The diffraction pattern observed in the Davisson-Germer experiment is due to:

Intermediate
A Photoelectric effect B Bragg reflection of electron waves C Compton scattering D X-ray interference
Show answer & explanation

Bragg reflection of electron waves

The electron waves reflected from crystal planes interfere constructively according to Bragg's law.

The accelerating voltage used in the Davisson-Germer experiment that produced the strongest diffraction was approximately:

Intermediate
A 12 V B 200 V C 54 V D 100 V
Show answer & explanation

54 V

At 54 V, the electron wavelength matched the spacing, giving a pronounced diffraction maximum.

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