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Express one joule in eV. Taking 1 amu = ...

Express one joule in eV. Taking 1 amu = 931 MeV. Calculate the mass of C-12 atom.

Text Solution

Verified by Experts

`1eV=1.6xx10^(-19)J`
or `1J=1/(1.6xx10^(-19))eV=6.25xx10^(18)eV`
Mass of C-12 atom = 12 amu
= `12xx931MeV=12xx931xx1.6xx10^(-13)J`
= `(12xx931xx1.6xx10^(-13))/((3xx10^(8))^(2))=1.99xx10^(-26)kg`
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