Which of the graphs shown below does not represent the relationship between incident light and the electron ejected…
Structure of Atom · Class 11 · JEE Main Previous Year Question
Which of the graphs shown below does not represent the relationship between incident light and the electron ejected from metal surface?
- a✓
- b
- c
- d
🧠 The Einstein Binary Einstein's photoelectric theory separates "Number" from "Energy." Intensity controls how many photons (and thus electrons) flow, while Frequency controls how much punch (Kinetic Energy) each electron has.
🗺️ The Graph Audit
- KE vs Frequency: This is a linear graph with a positive intercept on the x-axis (threshold frequency). Correct.
- Number of Electrons vs Intensity: This is a direct proportion passing through the origin. Correct.
- KE vs Intensity: Kinetic energy is independent of intensity. The graph should be a flat, horizontal line.
- Incorrect Representation: Option (a) incorrectly shows Kinetic Energy increasing with Intensity. In reality, shine a brighter light only gives you more electrons, not faster ones.
⚡ The "One Photon, One Electron" Rule Think of photons as individual packets. Making the light brighter just adds more packets; it doesn't change the size of each packet.
⚠️ Common Traps Many students intuitively feel that "more light = more energy." While true for the total beam, it is false for the individual electron.
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