SMART GUESSES THAT CAN COME IN SSC EXAMS,UPSC PRELIM


Hertz observation
Hertz observed that spark jump more readily when the detector was exposed to ultraviolet light this observe lead to him to conclude that light fluctuated the emission f charge from metallic sphere.

Lenard’s observation
He observed that when ultraviolet light was allowed to fall on a metallic electrode C electron were emitted by it these electron are attracted toward an electrode A maintained at positive potential thus the electric current began to flow in the circuit.

Cut of potential or stopping potential
The minimum negative potential we not applied to plate A for which photoelectric current become zero is called as cut of potential or stopping potential.

Threshold frequency

The minimum value of frequency of the incident light below which photoelectric emission is not possible is called as threshold frequency.

Reading all those points will help you remember important points which will help in easy and quick answer of the SSC general knowledge questions or other competitive exam

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