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