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Monochromatic radiation emitted when electron on hydrogen atom jumps from first excited to the ground state irradiates a phototsensitive material. he stopping potential is measured to be 3.57 V. The threshold frequency of the materials is:
Options
(a) 4 x 10¹⁵ Hz
(b) 5 x 10¹⁵ Hz
(c) 1.6 x 10¹⁵ Hz
(d) 2.5 x 10¹⁵ Hz
Correct Answer:
1.6 x 10¹⁵ Hz
Explanation:
n → 2 – 1 E = 10.2 eV kE = E – ?
Q = 10.20 – 3.57 h u₀ = 6.63 eV
u₀ = 6.63 x 1.6 x 10⁻¹⁹ / 6.67 x 10⁻³⁴
= 1.6 x 10¹⁵ Hz
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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 black body radiates 20 W at temperature 227⁰C. It temperature of the black body
- A DC ammeter has resistance 0.1Ω and its current ranges 0-100A. If the range
- Four indentical thin rods each of mass M and length l, form a square frame
- A wheel has angular acceleration of 3.0 rad/sec² and an initial angular speed of 2.00
- The mass of a lift is 2000kg. When the tension in the supporting cable is 28000N, then its acceleration is
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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