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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: - What is the Q-value of the reaction?
¹H+⁷Li→⁴He+⁴He
- The barrier potential of a p-n junction depends on
- The nuclei of which one of the following pairs of nuclei are isotones?
- Two positive ions, each carrying a charge q, are separated by a distance d
- An electric dipole of dipole moment p is aligned parallel to a uniform electric field E
Topics: Dual Nature of Matter and Radiation
(150)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- What is the Q-value of the reaction? ¹H+⁷Li→⁴He+⁴He
- The barrier potential of a p-n junction depends on
- The nuclei of which one of the following pairs of nuclei are isotones?
- Two positive ions, each carrying a charge q, are separated by a distance d
- An electric dipole of dipole moment p is aligned parallel to a uniform electric field E
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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