| ⇦ | 
| ⇨ |
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: - Across a metallic conductor of non-uniform cross-section, a constant potential
- The limiting angle of incidence for an optical ray that can be transmitted
- A ray enters a glass sphere of refractive index μ=√3 at an angle of incidence of 60⁰
- A parallel beam of light of wavelength λ is incident normally on a narrow slit
- The horizontal component of earth’s magnetic field at a place is 3×10⁻⁴ T
Topics: Dual Nature of Matter and Radiation
(150)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- Across a metallic conductor of non-uniform cross-section, a constant potential
- The limiting angle of incidence for an optical ray that can be transmitted
- A ray enters a glass sphere of refractive index μ=√3 at an angle of incidence of 60⁰
- A parallel beam of light of wavelength λ is incident normally on a narrow slit
- The horizontal component of earth’s magnetic field at a place is 3×10⁻⁴ T
Topics: Dual Nature of Matter and Radiation (150)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
18000+ students are using NEETLab to improve their score. What about you?
Solve Previous Year MCQs, Mock Tests, Topicwise Practice Tests, Identify Weak Topics, Formula Flash cards and much more is available in NEETLab Android App to improve your NEET score.
Share this page with your friends
Leave a Reply