Hola mate........... Try this......
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Heyyaa mate.. ☺☺
See attachment
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Explanation:
ew=hc/lamda
6.62607015×10−34=h
c=3*10^8
lamda=300m
ew=6.626*10^-28
n of photons=e/ew=10*1000/6.626*10^-28=1.5*10^31
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