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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
Related Questions: - An ideal gas is expanding such that PT²=constant. The coefficient of volume
- The photoelectric threshold wevelength for potassium (work function being 2 eV) is
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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
- An ideal gas is expanding such that PT²=constant. The coefficient of volume
- The photoelectric threshold wevelength for potassium (work function being 2 eV) is
- The material suitable for making electromagnets should have
- If in a nuclear fusion process, the masses of the fusing nuclei be m₁ and m₂
- A wire is suspended vertically from one of its ends is stretched by attaching a weight
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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