Question:
The expelled excited electron from chlorophyll-a after photo excitation comes back to ground state in ___________.
The expelled excited electron from chlorophyll-a after photo excitation comes back to ground state in ___________.
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Excited chlorophyll electron returns to ground state in {one nanosecond ($10^{-9}$ s)}.
Updated On: Feb 4, 2026
- $10^{-9}$ minutes
- $10^{-8}$ minutes
- $10^{-8}$ hours
- $10^{-9}$ seconds
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The Correct Option is D
Solution and Explanation
Step 1: Photoexcitation of chlorophyll.
When chlorophyll-a absorbs light energy, its electrons get excited to a higher energy level.
Step 2: Return to ground state.
If the excited electron does not participate in photochemical reactions, it quickly returns to the ground state.
Step 3: Time duration.
The excited electron returns to the ground state within $10^{-9$ seconds}, releasing excess energy as heat or fluorescence.
When chlorophyll-a absorbs light energy, its electrons get excited to a higher energy level.
Step 2: Return to ground state.
If the excited electron does not participate in photochemical reactions, it quickly returns to the ground state.
Step 3: Time duration.
The excited electron returns to the ground state within $10^{-9$ seconds}, releasing excess energy as heat or fluorescence.
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