| ⇦ | 
| ⇨ |
Two radiations of photons energies 1 eV and 2.5 eV, successively illuminate a photosensitive metallic surface of work function 0.5 eV. The ratio of the maximum speeds of the emitted electrons is:
Options
(a) 1 : 4
(b) 1 : 2
(c) 1 : 1
(d) 1 : 5
Correct Answer:
1 : 2
Explanation:
According to the Einstein’s photoelectric effect, the K.E. of the radiated electrons
K.Eₘₐₓ = E – W
1/2 mv₁² = (1 – 0.5) eV = 0.5 eV
1/2 mv₂² = (2.5 – 0.5 eV = 2 eV
v₁ / v₂ = √ 0.5 / 2 = 1 / √4 = 1/2
Related Questions: - The wavelength of kα, X-rays produced by an X-ray tube 0.76Å. The atomic number
- A block of mass 0.50 kg is moving with a speed of 2.00 ms⁻¹ on a smooth surface.
- For inelastic collision between two spherical rigid bodies
- Light propagates rectilinearly because of its
- A 1 µA beam of protons with a cross-sectional area of 0.5 sq.mm is moving with a velocity
Topics: Dual Nature of Matter and Radiation
(150)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- The wavelength of kα, X-rays produced by an X-ray tube 0.76Å. The atomic number
- A block of mass 0.50 kg is moving with a speed of 2.00 ms⁻¹ on a smooth surface.
- For inelastic collision between two spherical rigid bodies
- Light propagates rectilinearly because of its
- A 1 µA beam of protons with a cross-sectional area of 0.5 sq.mm is moving with a velocity
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