Use app×
Join Bloom Tuition
One on One Online Tuition
JEE MAIN 2025 Foundation Course
NEET 2025 Foundation Course
CLASS 12 FOUNDATION COURSE
CLASS 10 FOUNDATION COURSE
CLASS 9 FOUNDATION COURSE
CLASS 8 FOUNDATION COURSE
0 votes
5.1k views
in Physics by (67.8k points)

A sodium lamp emits 3.14×1020 photons per second. The distance from the sodium lamp where flux of photon is one photon per second per cm2 :–

(a) 5x109 cm 

(b) 5x108 cm

(c) 0.5×109 cm 

(d) Zero

1 Answer

+1 vote
by (79.0k points)
selected by
 
Best answer

Correct Option (a) 5x109 cm 

Explanation: 

Photon flux at a distance d = no. of photons emitted per second/4πd2

= 3.14 x 1020/4 x 3.14 x d2

d = 5 x 109 cm

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.

Categories

...