⇦ | ⇨ |
The number of photons of wavelength of 540 nm emitted per second by an electric bulb of power 100 W is (given h=6×10⁻³⁴ J-s)
Options
(a) 100
(b) 1000
(c) 3×10²⁰
(d) 3×10¹⁸
Correct Answer:
3×10²⁰
Explanation:
Power = nhc / ( × t)
⇒ 100 = [n × (6 × 10⁻³⁴) × (3 × 10⁸)] / (540 × 10⁹ × 1)
⇒ n × 18 × 10⁻²⁶ / 540 × 10⁻⁹ = 100
⇒ n = 100 × 540 × 10⁻⁹ / 18 × 10⁻²⁶ = 3 x 10²⁰
Related Questions: - The moon’s radius is 1/ 4 that of the earth and its mass is 1 / 80 times that of the earth
- A body of weight W newton is at the surface of the earth.
- In Moseley’s law √ν=a(z-b), the values of the screening constant for K-series
- A certain current on passing through a galvanometer produces a deflection
- The radius of the first orbit of the hydrogen atom is a₀. The radius of the second orbit
Topics: Dual Nature of Matter and Radiation
(150)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- The moon’s radius is 1/ 4 that of the earth and its mass is 1 / 80 times that of the earth
- A body of weight W newton is at the surface of the earth.
- In Moseley’s law √ν=a(z-b), the values of the screening constant for K-series
- A certain current on passing through a galvanometer produces a deflection
- The radius of the first orbit of the hydrogen atom is a₀. The radius of the second orbit
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