| Direction: According to the 6ohr model, the energy levels of a hydrogen atom can be found by making two assumptions. |
| (i) The electrons move in a circular orbit and (ii) the angular momentum of the electron in the n\[th\]energy level is quantized to have a value,\[n\frac{h}{2\pi }\]. The levels calculated with a nuclear charge \[Ze\] deals with a single electron in the orbit are called hydrogenic levels. Assume that the two electrons in the ground, state of a helium atom occupy the corresponding lowest hydrogenic level. |
A) 8T
B) 4T
C) 6T
D) 2T
Correct Answer: A
Solution :
As for atom, \[\frac{5}{2}kT=13.6\] ?(i) Energy required to remove two electrons from He must be greater than 54.4 eV. \[\frac{3}{2}kT'>54.4\] ?(ii) From Eqs. (i) and (ii), we get \[\frac{3T'}{5T}>\frac{54.4}{13.6}\] \[T'>\frac{20}{3}T\] \[T'>6.66T\] So, among the options \[T'\] can be 8T
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