| ⇦ | 
| ⇨ |
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
Related Questions: - An electron of mass Mₑ, initially at rest, moves through a certain distance in a uniform
- The kinetic energy of particle moving along a circle of radius R depends
- A particle of unit mass undergoes one-dimensional motion such that its velocity varies
- In a pure capacitive A.C circuit, current and voltage differ in phase by
- Maximum velocity of the photoelectron emitted by a metal is 1.8×10⁶ ms⁻¹.
Topics: Dual Nature of Matter and Radiation
(150)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- An electron of mass Mₑ, initially at rest, moves through a certain distance in a uniform
- The kinetic energy of particle moving along a circle of radius R depends
- A particle of unit mass undergoes one-dimensional motion such that its velocity varies
- In a pure capacitive A.C circuit, current and voltage differ in phase by
- Maximum velocity of the photoelectron emitted by a metal is 1.8×10⁶ ms⁻¹.
Topics: Dual Nature of Matter and Radiation (150)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
18000+ students are using NEETLab to improve their score. What about you?
Solve Previous Year MCQs, Mock Tests, Topicwise Practice Tests, Identify Weak Topics, Formula Flash cards and much more is available in NEETLab Android App to improve your NEET score.
Share this page with your friends
Leave a Reply