3. The number of quanta of radiatio...
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3. The number of quanta of radiation of frequency 4.98 * 1014 s-1 required to melt 100 g of ice are (latent heat of melting of ice is 33 joule per g) (1) 1020 (2) 1022 (3) 1024 (4) 6.023 * 1021 9. In

JEE/Engineering Exams
Chemistry
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The energy required to melt ( 100 mathrm{J} ) of ice is [ begin{aligned} 8 &=m L=log _{x} 33 J / g &=3300 mathrm{J} end{aligned} ] If ( n ) be the number fromantar roniation then energyy [ E=n h v ] ( therefore quad n h v=33005 ) [ begin{aligned} Rightarrow n &=frac{3300}{h^{2}} &=frac{3300}{6.62 times 10^{-3} 4 times 4.98 times 10^{14}} sqrt{n} &=10^{22} end{aligned} ]
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