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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: - If oxygen has root mean square velocity of C m/s, then root mean square velocity of H
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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
- If oxygen has root mean square velocity of C m/s, then root mean square velocity of H
- Two masses of 9 g and 6 g are connected with a string which is passing over a frictionless
- In the experiment for determination of velocity of sound in air,
- Hard X-rays for the study of fractures in bones should have a minimum wavelength
- We get Balmer series when electron comes from
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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