Chemistry
Chemistry
10th Edition
ISBN: 9781305957404
Author: Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher: Cengage Learning
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Quantum chemistry deals with the properties of chemical systems and their reactions. The branch of chemistry which is more concerned with quantum chemistry is physical chemistry. It is a more sophisticated field of theoretical physics which is concerned …
Question
A laser pulse at 500. nm contains 4.95 mJ of energy. How many photons are in the laser pulse?
 
Expert Solution
Check Mark
Step 1

E = nhv 

E is energy

n is number of photons

h is planck's constant 

v is frequency and it is ratio of speed of light to wavelength [c/λ] 

So now E = 4.95 x 10-3 J 

λ = 500nm 

c = 3 x 10+8 m/s 

h = 6.62 x 10-34 m2 Kg/s 

Now substitution of values will give us number of photons

 

 

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