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12.Atoms
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In an atom, two electrons move around the nucleus in circular orbits of radii $R$ and $4R.$ The ratio of the time taken by them to complete one revolution is : (neglect electric interaction)
A
$1 : 4$
B
$4 : 1$
C
$1 : 8$
D
$8 : 1$
Solution
We know,
$T \propto r^{3 / 2}$
$\frac{T_{1}}{T_{2}}=\left(\frac{r_{1}}{r_{2}}\right)^{\frac{3}{2}}=\left(\frac{R}{4 R}\right)^{\frac{3}{2}}=\frac{1}{8}$
Standard 12
Physics
Similar Questions
Match List $- I$ (Experiment performed) with List $-II$ (Phenomena discovered/associated) and select the correct option from the options given the lists
| List $- I$ | List $- II$ |
| $(1)$ Davisson and Genner | $(i)$ Wave nature of electrons |
| $(2)$ Millikan's oil drop experiment | $(ii)$ Charge of an electron |
| $(3)$ Rutherford experiment | $(iii)$ Quantisation of energy levels |
| $(4)$ Franck-Hertz experiment | $(iv)$ Existence of nucleus |
