alleryPhotoelectric current falls to zero at which voltage?
AThreshold voltage
BAccelerating volt
CStopping potential
DSaturation voltage
Answer & Solution
Correct answer: C. Stopping potential
1. A retarding voltage slows the escaping electrons.
2. At one value even the fastest fail to reach the collector.
3. The current is zero at the stopping potential.
4. So the answer is stopping potential.
_Source: syllabus Physics, Ch 11 'Dual Nature of Radiation and Matter'_
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