The number of quanta of radiations of frequency `4.75xx10^(13)s^(-1)` required to melt 100g of ice is (energy required to melt 1 g of ice is 350J)

Options

A. `1.113xx10^(23)`
B. `111.3xx10^(23)`
C. `11.13xx10^(23)`
D. `1.113xx10^(22)`

Answer

C

Explanation

Energy of a quantum
`=6.63xx10^(-34)Jsxx4.75xx10^(13)s^(-1)`
`=3.15xx10^(-20)J`
Energy required `=100xx350=3.50xx10^(4)`
NO.of quanta `=(3.50xx10^(4))/(3.15xx10^(-20))`
`=11.13xx10^(23)`