In a photoelectric experiment with a material of work ...

CBSE Class 12 Physics 2025 All Sets Solved Paper

Question : 9 of 16

Marks: +1, -0

In a photoelectric experiment with a material of work function 2.1 eV, the stopping potential is found to be 2.5 V. The maximum kinetic energy of ejected photoelectrons is

0.4 eV
2.1 eV
2.5 eV
4.6 eV

Solution:

Using the photoelectric equation

KE_{max} = eV_s

Where
• Vs = 2.3 V (Stopping potential)
•

e = 1.6 × 10^{-19}C

(Charge of electron)

KE_{max} = 2.5 × 1 = 2.5 eV

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