| ⇦ | 
| ⇨ |
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 revolves in a circle at the rate of 10¹⁹ rounds per second.
- An electron having charge e and mass m is moving in a uniform electric field E.
- Two particles P and Q start from origin and execute simple harmonic motion along X-axis
- A solid sphere, a hollow sphere and a ring are released from top of an inclined
- The upper half of an inclined plane of inclination θ is perfectly smooth while lower
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 revolves in a circle at the rate of 10¹⁹ rounds per second.
- An electron having charge e and mass m is moving in a uniform electric field E.
- Two particles P and Q start from origin and execute simple harmonic motion along X-axis
- A solid sphere, a hollow sphere and a ring are released from top of an inclined
- The upper half of an inclined plane of inclination θ is perfectly smooth while lower
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