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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: - A ball of mass 2 kg and another of mass 4 kg are dropped together from
- A light emitting diode(LED) has a voltage drop of 2 volt across it
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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 ball of mass 2 kg and another of mass 4 kg are dropped together from
- A light emitting diode(LED) has a voltage drop of 2 volt across it
- Which of the following measurement is most precise?
- The total radiant energy per unit area, normal to the direction of incidence
- A body of weight W newton is at the surface of the earth.
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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