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NCERT Class XI Chemistry Structure of Atom Solutions

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Question : 46 of 67
Marks: +1, -0
Nitrogen laser produces a radiation at a wavelength of 337.1 nm. If the number of photons emitted is 5.6 × 102410^{24}, calculate the power of this laser.
Solution:  
Wavelength of nitrogen = 337.1 nm = 337.1 × 10−9 m10^{-9}\,\text{m}
Number of photons = 5.6 × 102410^{24}
Energy of photons (E) = nhcλ\frac{nhc}{\lambda} =
5.6×1024×6.626×10−34×3×108337.1×10−9\frac{5.6\times10^{24}\times6.626\times10^{-34}\times3\times10^8}{337.1\times10^{-9}}
= 3.30 × 106 J10^6\,\text{J}
Power of this nitrogen laser is 3.30 × 106 J10^6\,\text{J}
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