Q. Electron – volt is the unit of energy (1 eV = 1.6 $\times 10^{- 19}$J). in H-atom, the binding energy of electron in first orbit is 13.6 eV. The same in joule (J) is
A) $10 \times 10^{- 19}$J
B) 21.76$\times 10^{- 19}$J
C) 13.6$\times 10^{- 19}$J
D) None of these
Explanation
Given, 1 eV=1.6$\times 10^{- 19\ }$J $13.6$ eV=13.6$\times 1.6 \times 110^{- 19\ }$J $= 21.76 \times 10^{- 19}\$J
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.