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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 speed of emitted electrons will be
Options
(a) 1 : 4
(b) 1 : 2
(c) 1 : 1
(d) 1 : 5
Correct Answer:
1 : 2
Explanation:
The maximum kinetic energy of emitted electrons is given by
K.E = WorkFunction(₀) – WorkFunction(₁)
K.E₁ = 1 eV – 0.5 eV = 0.5 eV
K.E₂ = 2.5 eV – 0.5 eV = 2.0 eV
K.E₁ / K.E₂ = 0.5 eV / 2 eV = 1/4
KE = mv² /2
v₁ / v₂ = √1/4 = 1/2
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Topics: Dual Nature of Matter and Radiation
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Subject: Physics
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Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- The half-life of radioactive element is 600 yr. The fraction of sample
- The electric field in a certain region is given by E=5i ̂-3ĵ kV/m. The potential
- A current of 5 A is passing through a metallic wire of cross-sectional area 4×10⁻⁶ m².
- A spherical shell of radius 10cm is carrying a charge q. If the electric potential
- A potentiometer circuit has been set up for finding the internal resistance of a given
Topics: Dual Nature of Matter and Radiation (150)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
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