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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
- The length of second pendulum is 1 m on earth. If mass and diameter
- Two spherical conductors A and B of radii 1 mm and 2 mm are separated by a distance
- The potential difference applied to an X-ray tube is 5 kV and the current through it
- Two equal and opposite charges of masses m₁ and m₂ are accelerated
- Reactance of a capacitor of capacitance C µF for A.C freqency (400 / π) Hz is 25 ohm
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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