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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
Related Questions: - If the terminal speed of a sphere of gold (density=19.5 kg/m³) is 0.2 m/s
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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
- If the terminal speed of a sphere of gold (density=19.5 kg/m³) is 0.2 m/s
- The point of suspension λ of a simple pendulum with normal time period T₁ is moving
- If R is the radius of the earth and g is the acceleration due to gravity
- Sodium has body centred packing. Distance between two nearest atoms is 3.7 Å.
- A microscope is having objective of focal length 1 cm and eye-piece of focal length 6 cm.
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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