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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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Topics: Dual Nature of Matter and Radiation
(150)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- A current I flows along the length of an infinitely long, straight, thin walled pipe.
- The current through an inductor changes from 3 A to 2 A is 1 m/s. If induced e.m.f.
- The electric potential at a point in free space due to a charge Q coulomb is Q x 10¹¹ v
- In a pure capacitive A.C circuit, current and voltage differ in phase by
- A 220 volts input is supplied to a transformer. The output circuit draws
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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