The period of rotation of electron on the 6-th Bohr orbit is __________ the period of rotation of electron on the 3- rd Bohr orbit.
A)equal to
B)twice
C)four times
D)six times
E)eight times

Question

Quizplus · Accepted Answer

The period of rotation of an electron in a Bohr orbit is proportional to the cube of the principal quantum number (n^3). Therefore, for the 6th orbit (n=6) compared to the 3rd orbit (n=3), the period of rotation is (6^3)/(3^3) = 216/27 = 8 times longer.

The Period of Rotation of Electron on the 6-Th Bohr