Question:
When blue light is incident on a certain metal surface, photoelectrons are emitted. When green light is incident on the same metal surface, no electrons are emitted. If the same metallic surface is exposed to yellow light,
When blue light is incident on a certain metal surface, photoelectrons are emitted. When green light is incident on the same metal surface, no electrons are emitted. If the same metallic surface is exposed to yellow light,
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Below threshold frequency → no emission regardless of intensity.
Updated On: Apr 24, 2026
- less energetic electrons will be emitted
- no electrons will be emitted
- more energetic electrons will be emitted
- electron emission depends on the intensity of light
- electron emission depends on the time of exposure
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The Correct Option is B
Solution and Explanation
Concept:
Photoelectric effect depends on frequency.
Step 1: Frequency order.
\[ \text{Blue}>\text{Green}>\text{Yellow} \]
Step 2: Observation.
Green light does not emit electrons $\Rightarrow$ frequency below threshold.
Step 3: Conclusion.
Yellow has even lower frequency $\Rightarrow$ no emission.
Step 1: Frequency order.
\[ \text{Blue}>\text{Green}>\text{Yellow} \]
Step 2: Observation.
Green light does not emit electrons $\Rightarrow$ frequency below threshold.
Step 3: Conclusion.
Yellow has even lower frequency $\Rightarrow$ no emission.
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