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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 de-Broglie wavelength associated with an electron accelerated by a potential
- Find the maximum velocity with which a train can be moved on a circular track
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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 de-Broglie wavelength associated with an electron accelerated by a potential
- Find the maximum velocity with which a train can be moved on a circular track
- A ball is dropped from a height of 20 cm. Ball rebounds to a height of 10cm
- To what temperature should the hydrogen at room temperature (27°C) be heated at constant
- 1 Wb/m² equal to
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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