1.

The energy of an electron is 4.0 xx10^(-19) J.Express it in eV.

Answer»

SOLUTION :SINCE 1 eV=`1.6xx10^(-19)J`
`THEREFORE 4.0 xx10^(-19)J=(4.0xx10^(-19))/(1.6xx10^(-19))eV=2.5eV`


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