| ⇦ | 
| ⇨ |
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: - Two sources P and Q produce notes of frequency 660 Hz each.
- In a coil having e.m.f. of 8 V induced for 0.05 s. The value of current changes
- The radius of the first orbit of the hydrogen atom is a₀. The radius of the second orbit
- The current in the windings of a toroid is 2.0 A. There are 400 turns
- A body of mass 3 kg acted upon by a constant force is displaced by S meter
Topics: Dual Nature of Matter and Radiation
(150)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Two sources P and Q produce notes of frequency 660 Hz each.
- In a coil having e.m.f. of 8 V induced for 0.05 s. The value of current changes
- The radius of the first orbit of the hydrogen atom is a₀. The radius of the second orbit
- The current in the windings of a toroid is 2.0 A. There are 400 turns
- A body of mass 3 kg acted upon by a constant force is displaced by S meter
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