| ⇦ | 
| ⇨ |
Monochromatic radiation emitted when electron on hydrogen atom jumps from first excited to the ground state irradiates a phototsensitive material. he stopping potential is measured to be 3.57 V. The threshold frequency of the materials is:
Options
(a) 4 x 10¹⁵ Hz
(b) 5 x 10¹⁵ Hz
(c) 1.6 x 10¹⁵ Hz
(d) 2.5 x 10¹⁵ Hz
Correct Answer:
1.6 x 10¹⁵ Hz
Explanation:
n → 2 – 1 E = 10.2 eV kE = E – ?
Q = 10.20 – 3.57 h u₀ = 6.63 eV
u₀ = 6.63 x 1.6 x 10⁻¹⁹ / 6.67 x 10⁻³⁴
= 1.6 x 10¹⁵ Hz
Related Questions: - To obtain a p-type semiconductor, germanium must be doped with
- Current in a coil changes from 4 A to zero in 0.1 second and the emf induced is 100V
- The amplitude of S.H.M. y=2 (sin 5πt+√2 cos 5πt) is
- The maximum and minimum magnitudes of the resultant of two vectors
- A body takes 5 minute for cooling from 50⁰C to 40⁰C. Its temperature
Topics: Dual Nature of Matter and Radiation
(150)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- To obtain a p-type semiconductor, germanium must be doped with
- Current in a coil changes from 4 A to zero in 0.1 second and the emf induced is 100V
- The amplitude of S.H.M. y=2 (sin 5πt+√2 cos 5πt) is
- The maximum and minimum magnitudes of the resultant of two vectors
- A body takes 5 minute for cooling from 50⁰C to 40⁰C. Its temperature
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