Browse by Stream
QnA
Home
QnA
Go To Your Study Dashboard

Get Answers to all your Questions

header-bg qa
  • Home
  • NCERT
  • Lifetimes of the molecules in the excited states are often measured by using pulsed radiation source of duration nearly in the nano second range. If the radiation source has the duration of 2 ns and the number of photons emitted during the pulse source

2.49    Lifetimes of the molecules in the excited states are often measured by using pulsed radiation source of duration nearly in the nano second range. If the radiation source has the duration of 2 ns and the number of photons emitted during the pulse source is 2.5\times 10^{15}, calculate the energy of the source.

Answers (1)

best_answer

Given the duration of a radiation source = 2\ ns = 2\times10^{-9}s  and the number of pulse source is = 2.5\times10^{15}, then its frequency will be:

\nu = \frac{1}{2\times10^{-9}s} = 0.5\times10^{9}s^{-1}  

and the energy of the source for the given frequency will be:

E= Nh\nu = (2.5\times10^{15})(6.626\times10^{-34}Js)\times(0.5\times10^{9}s^{-1})

= 8.28\times10^{-10}J

 

Posted by

Divya Prakash Singh

View full answer

Crack CUET with india's "Best Teachers"

  • HD Video Lectures
  • Unlimited Mock Tests
  • Faculty Support
cuet_ads

Similar Questions

Trending Articles/News

anam-khan

CBSE Board Exams 2025: Counselling for students, parents from February 1
anam-khan

CBSE asks schools to include APAAR IDs in school ID after NTA says ‘not mandatory’ for NEET
anam-khan

CBSE Board Exams 2025: What the ethics code bans from exam centres

Latest Question