Photoelectric Graph Interpretation
Hardphysics
Slope of plot of stopping potential vs frequency (above threshold) gives?
Select the correct option:
Solution
Incorrect! Answer:
Planck's constant / e
- Linear Equation: From eV0=hf−ϕ.
- Standard Form (y=mx+c): Divide by e:
- V0=(eh)f−eϕ
- Identify Slope: The slope of the V0 vs f graph is the coefficients of f, which is h/e.
- Intercepts: The x-intercept gives the threshold frequency (f0), and the magnitude of the y-intercept gives ϕ/e.
- Note: This slope is universal for all metals, as h and e are fundamental constants.
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About This Question
- Subject
- physics
- Chapter
- dual nature
- Topic
- photoelectric graph interpretation
- Difficulty
- Hard
- Year
- 2025
Solution
Correct Answer:
Planck's constant / e
- Linear Equation: From eV0=hf−ϕ.
- Standard Form (y=mx+c): Divide by e:
- V0=(eh)f−eϕ
- Identify Slope: The slope of the V0 vs f graph is the coefficients of f, which is h/e.
- Intercepts: The x-intercept gives the threshold frequency (f0), and the magnitude of the y-intercept gives ϕ/e.
- Note: This slope is universal for all metals, as h and e are fundamental constants.
This hard difficulty physics question is from the chapter dual nature, covering the topic of photoelectric graph interpretation. It appeared in the 2025 exam.
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