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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 body of mass 0.25 kg is projected with muzzle velocity 100 m/s from a tank
- The focal lengths of a converging lens are fᵥ and fᵣ for violet and red lights
- An electric motor operating on a 60 volt D.C supply draws a current of 10 amp.
- An electric bulb has a rated power of 50W at 100 V. if it used on an a.c. source
- A double slit experiment is performed with light of wavelength 500 nm. A thin film
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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