| ⇦ | 
| ⇨ |
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: - An elevator car whose floor to ceiling distance is equal to 2.7m starts
- The kinetic energy of particle moving along a circle of radius R depends
- A pellet of mass 1 g is moving with an angular velocity of 1 rad/s along a circle
- A ballet dancer, dancing on smooth floor, is spinning about a vertical axis
- When 1 kg of ice at 0⁰C melts to water at 0⁰C, the resulting change in its entropy
Topics: Dual Nature of Matter and Radiation
(150)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- An elevator car whose floor to ceiling distance is equal to 2.7m starts
- The kinetic energy of particle moving along a circle of radius R depends
- A pellet of mass 1 g is moving with an angular velocity of 1 rad/s along a circle
- A ballet dancer, dancing on smooth floor, is spinning about a vertical axis
- When 1 kg of ice at 0⁰C melts to water at 0⁰C, the resulting change in its entropy
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