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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: - The electron drift speed is small and the change of the electron is also small
- A ray of light is incident on a transparent glass slab of refractive index 1.62
- In Young’s double slit experiment the distance between the slits and the screen
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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
- The electron drift speed is small and the change of the electron is also small
- A ray of light is incident on a transparent glass slab of refractive index 1.62
- In Young’s double slit experiment the distance between the slits and the screen
- Alternating current is transmitted to distant places at
- A point charge q is placed at a distance x/2 directly above the centre of a cube
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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