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Grade: 11

                        

The number of photons of light of ν reciprocal =2.5*10^6 m^-1 necessary to provide 1J of energy are a) 2*10^18. b)2*10^17 c)2*10^20. d) 2*10^19

2 years ago

Answers : (1)

Jobin C J
22 Points
							
E=nhν
 
But ν=c/λ
 
So we can write E=nhc/λ
 
E=nhc/λ  ⇒  E=nhc×1/λ
 
But ṽ=1/λ
 
So E=nhcṽ
 
E=1J,  h=6.63×10-34Js, C=3×108ms-1, ṽ=2.5×106m-1
 
n= E/(hcṽ)
 
n= 1/(6.63×10-34 × 3×108 × 2.5×106)
 
n= 2×1018
 
Option 'a' is correct.
2 years ago
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