The energy difference between the first two levels of hydrogen atom is `10.2eV`. For another element of atomic number 10 and mass number 20, this will be

Options

A. 1020eV
B. 2040eV
C. 0.51eV
D. 0.102eV

Answer

A

Explanation

Energy difference `DeltaEpropZ^(2)`
`:.(DeltaE_(1))/(DeltaE_(2))=((Z_(H))/(Z_(X)))^(2)implies10.2/(DeltaE_(2))=(1/10)^(2)`
`:.DeltaE_(2)=10.2xx100=1020eV`