I simply have no idea where to start with thisproblem or what procedure to follo

Question

I simply have no idea where to start with thisproblem or what procedure to follow. It's pretty self-explanatory,but I have no notion as to what to do here. Everywhere I've gone tolook at problems like this one have had different informationprovided to them than what I have here.

A pulse of light from a laser has a frequency of 4.75×1014 Hzand a total energy of 7.50×10-16 J. How many photons were inthe pulse?


Thanks for your help!
-Izzy
I simply have no idea where to start with thisproblem or what procedure to follow. It's pretty self-explanatory,but I have no notion as to what to do here. Everywhere I've gone tolook at problems like this one have had different informationprovided to them than what I have here.

A pulse of light from a laser has a frequency of 4.75×1014 Hzand a total energy of 7.50×10-16 J. How many photons were inthe pulse?


Thanks for your help!
-Izzy

Explanation / Answer

We have the for energy is given by            E = Nh f The number of photons is           N =E/(hf) Here E = 7.50×10-16 J           h=6.626*10-34Js                    f=  4.75×1014 Hz Substitute the values,.

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