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The work function of a substance is 4.0 eV. The longest wavelength of light that can cause photoelectron emission from this substance is approximately
Options
(a) 540 nm
(b) 400 nm
(c) 310 nm
(d) 220 nm
Correct Answer:
310 nm
Explanation:
hc / λ(m) = Work function ⇒ λ(max) = hc / w
λ(max) = (6.6 x 10⁻³⁴) × (3 × 10⁸) / (4 × 1.6 × 10⁻¹⁹)
λ(max) = [(6.6 × 3) / (4 × 1.6)] × 10⁻⁷ m
λ(max) = 310 nm
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Subject: Physics
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Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- At a given temperature the root mean square velocities of oxygen and hydrogen
- A point source is kept at a distnace 1000m has an illumination I. To change the illumination
- 64 drops of mercury, each charged to a potential of 10 V, are combined
- According to Hook’s law of elasticity, if stress is increased, the ratio of stress
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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
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