| ⇦ | 
| ⇨ |
The lowest frequency of light that will cause the emission of photoelectrons from the surface of a metal (for which work function is 1.65 eV) will be
Options
(a) 4×10¹⁰ Hz
(b) 4×10¹⁴ Hz
(c) 4×10¹¹ Hz
(d) 4×10¹⁵ Hz
Correct Answer:
4×10¹⁴ Hz
Explanation:
Maximum wavelength (in Å) = 12375 / ɸ (in eV)
⇒ λ₀ = 12375 / 1.65 = 7,500 Å = 7.5 × 10⁻⁷ m
Hence minimum frequency = ʋ₀ = c / λ₀
⇒ ʋ₀ = (3 × 10⁸) / (7.5 × 10⁻⁷) = 4 × 10¹⁴ Hz
Related Questions: - A heavy uniform chain lies on a horizontal top table.If the coefficient of friction
- Wavefront is the locus of all points, where the particles of the medium
- In intrinsic semiconductor at room temperature number of electrons and holes are
- The ‘rad’ is the correct unit used to report the measurement of
- Two bodies A(of mass 1kg) and B(of mass 3 kg) are dropped from heights of 16m and 25m
Topics: Dual Nature of Matter and Radiation
(150)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- A heavy uniform chain lies on a horizontal top table.If the coefficient of friction
- Wavefront is the locus of all points, where the particles of the medium
- In intrinsic semiconductor at room temperature number of electrons and holes are
- The ‘rad’ is the correct unit used to report the measurement of
- Two bodies A(of mass 1kg) and B(of mass 3 kg) are dropped from heights of 16m and 25m
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