Join Sarthaks eConnect Today - Largest Online Education Community!
0 votes
asked in Physics by (69.9k points)

A 100 watt light bulb giving monochromatic light of wavelength 6000 Å is placed at the centre of a spherical chamber of radius 0.20 m. It is given that only 50% energy supplied to the bulb is converted into energy. Assuming that the surface of the chamber is perfectly absorbing, the number of photons per second (average) arriving at the surface of spherical chamber is 

(1) 1.51×1020 

(2) 0.15×1020 

(3) 15×1023 

(4) 15×1018

1 Answer

+1 vote
answered by (70.1k points)
selected by
Best answer

Correct option : (1) 1.51×1020 

Explanation :

Energy of each photon 

Energy of light emitted by the bulb per second E is = 100 x 50/100 = 50 watt

Number of photons reaching the surface per second

Happy Diwali Wishes

Related questions

Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. Students (upto class 10+2) preparing for All Government Exams, CBSE Board Exam, ICSE Board Exam, State Board Exam, JEE (Mains+Advance) and NEET can ask questions from any subject and get quick answers by subject teachers/ experts/mentors/students.

One Thought Forever

“There is a close connection between getting up in the world and getting up in the morning.“
– Anon