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Find the number of quanta of radiations ...

Find the number of quanta of radiations of frequency `4.67xx10^(13)s^(-1)`, that must be absorbed in order to melt 5 g of ice. The energy required to melt 1 g of ice is 333J.

Text Solution

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Energy requried to melt 5g of ice
`=5xx333=1665J`
Energy associated with one quantum.
`=hv=(6.62xx10^(-34))xx(4.67xx10^(13))`
`=30.91xx10^(-21)J`
Number of quanta requried to melt 5 g of ice
`=(1665)/(30.91xx10^(-21))=53.8xx10^(21)=5.38xx10^(22)`.
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