Learning Path
Question & Answer1
Understand Question2
Review Options3
Learn Explanation4
Explore TopicChoose the Best Answer
A
Einstein's theory of relativity
B
Wave-particle duality
C
Photon energy quantization
D
Classical wave theory
Understanding the Answer
Let's break down why this is correct
Answer
Black‑body radiation led Planck to introduce energy quanta, showing that energy is exchanged in discrete packets. In the same way, the photoelectric effect prompted Einstein to propose that light itself is made of photons—discrete energy quanta that transfer energy to electrons. Einstein’s idea explained why light below a certain frequency, no matter how intense, cannot eject electrons, while above it, the energy of each photon determines the kinetic energy of emitted electrons. For example, shining a 500 nm laser (photon energy ≈ 2. 5 eV) on a metal with a 2 eV work function ejects electrons with about 0.
Detailed Explanation
The photoelectric effect showed that light can be broken into tiny packets of energy called photons. Other options are incorrect because Einstein’s relativity explains how space and time change, but it does not describe how light gives electrons energy; Wave‑particle duality says light can act like a wave or a particle, but the photoelectric effect specifically shows that light’s energy comes in discrete packets.
Key Concepts
Quantum Mechanics
Photoelectric Effect
Energy Quantization
Topic
Historical Origins of Quantum Mechanics
Difficulty
medium level question
Cognitive Level
understand
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