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QAIPMT-2011-Ph-1924: NEET 2011 Physics - Class 12 AIPMT-2011-Ph-1924 Solution: Light of two different frequencies whose photons have energies…
Light of two different frequencies whose photons have energies 1 eV and 2.5 eV respectively illuminate a metallic surface whose work function is 0.5 eV successively. Ratio of maximum speeds of emitted electrons will be
Multiple Choice Options
- A 1:04
- B 1:02
- C 1:01
- D 1:05
Step-by-Step Verified Solution
According to Einsten�s photoelectric effect, the K.E. of the radiated electrons
K.E max = E � W
1 2 m v 1 2 = (1 - 0.5) eV = 0.5 eV
1 2 m v 2 2 = (2.5 - 0.5) eV = 2 eV
v 1 v 2 = 0.5 2 = 1 : 2