MCQ
Addition of $6.65 \times 10^4$ and $8.95 \times 10^3,$ in terms of scientific notation will be :
- ✓$7.545 \times 10^4$
- B$75.45 \times 10^3$
- C$754.5 \times 10^2$
- D$75.45 \times 10^0$
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$(A)$ Kinetic energy of electron is $\propto \frac{ Z ^{2}}{ n ^{2}}$.
$(B)$ The product of velocity (v) of electron and principal quantum number (n), 'vn' $\propto Z ^{2}$.
$(C)$ Frequency of revolution of electron in an orbit is $\propto \frac{ Z ^{3}}{ n ^{3}}$.
$(D)$ Coulombic force of attraction on the electron is $\propto \frac{ Z ^{3}}{ n ^{4}}$.
Choose the most appropriate answer from the options given below :