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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 point charge q is situated at a distance r on axis from one end of a thin
- Moment of inertia, along the diameter of a ring is
- A bomb of mass 16 kg at rest explodes into two pieces of masses of 4 kg and 12 kg.
- If λ₁ and λ₂ are the wavelengths of the first members of the Lyman and Paschen
- 64 drops of mercury, each charged to a potential of 10 V, are combined
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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