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The potential difference that must be applied to stop the fastest photoelectrons emitted by a nickel surface, having work function 5.01 eV, when ultraviolet light of 200 nm falls on it, must be:
Options
(a) 2.4 V
(b) – 1.2 V
(c) – 2.4 V
(d) 1.2 V
Correct Answer:
1.2 V
Explanation:
Kₘₐₓ = hc / – W = hc / λ – 5.01
= 12375 / λ(in Å) – 5.01
12375 / 2000 – 5.01 = 6.1875 – 5.01 = 1.17775
= 1.2 V
Related Questions: - A car is moving with uniform acceleration. It covers 200 m in 2 sec and 220 m
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Topics: Dual Nature of Matter and Radiation
(150)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- A car is moving with uniform acceleration. It covers 200 m in 2 sec and 220 m
- A coil has resistance 30 ohm and inductive reactance 20 ohmn at 50 Hz frequency.
- The molar specific heats of an ideal gas at constant pressure and volume are denoted
- The half life of a radioactive isotope ‘X’ is 20 years. It decays to another element Y
- Two capacitors 3μF and 4μF, are individually charged across a 6 V battery.
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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