Physics Dawn of Modern Physics ETEA 2015
PMDC Verified Question 51 of 52
Which of the following is the best evidence for the wave nature of matter?
A
The reflection of electrons by crystal
B
The photoelectric effect
C
The Compton effect
D
The spectral radiation form cavity radiation
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: The reflection of electrons by crystal
Concept:

To prove that matter (like electrons) has wave-like properties, it must exhibit phenomena exclusive to waves, such as interference or diffraction.

Formula:

$$ \lambda = \frac{h}{p} $$

Solution:

  • The Davisson-Germer experiment directed a beam of electrons at a nickel crystal.


  • The electrons scattered, forming a diffraction pattern (reflection from crystal planes) that perfectly matched the wave behavior predicted by de Broglie.


Why other options are incorrect:

The photoelectric effect and Compton effect are classic proofs for the particle nature of light, not the wave nature of matter. Cavity radiation relies on quantized energy states.

Quality & Fidelity Assurance: Every question on BeambePrep is rigorously curated against the official PMDC syllabus with zero filler, zero out-of-syllabus content, and zero typos. When an authentic past paper originally contained a historical mistake or ambiguity from the examining board (such as UHS or NUMS), BeambePrep faithfully reflects the original paper while detailing the nuance and scientific consensus in the autopsy above.

Previous Question All Dawn of Modern Physics MCQs Next Question

Want to solve full-length papers under timed exam conditions?

Practice with zero-scroll lockdown sprints, dynamic latency zone timers, live peer selection telemetry, and the automated Amber mistake recovery loop.

Enter Arena Sprint iOS App Android App