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# Atom nuclei Class 12 Notes | EduRev

## Class 12 : Atom nuclei Class 12 Notes | EduRev

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CBSE XII
th
Atoms Nuclei
Physics Classes by Puneet kr. / 9810350501 1
Question.1
Draw a schematic arrangement of the Geiger - Marsden experiment.
Give Rutherford's observation and discuss the significance of this experiment. Obtain the expression
which helps us to get an idea of the size of a nucleus, using these observations.
Question.2
State Bohr's postulates for explaining the spectrum of hydrogen atom. Derive the expression for the
radius of the ground state orbit of hydrogen atom, using Bohr's postulates. Derive the expression
for total energy of an electron bound to hydrogen atom. How does the potential energy change with
increase in the principal quantum number(n) for the electron and why? Calculate the frequency of
the photon, which can excite the electron to -3.4 eV from
-13.6eV
Question.3
The ground state energy of hydrogen atom is -13.6 eV.
(i) What is the kinetic energy of an electron in the 3
rd
excited state?
(ii) if the electron jumps to the ground state from the 3
rd
excited state, calculate the
wavelength of
the photon emitted.
Question.4
The value of ground state energy of hydrogen atom is -13.6 eV.
(i) What does the negative sign signify?
(ii) How much energy is required to take an electron in this atom from ground state to first
excited state ?
Question.5
The electron in a given Bohr orbit has a total energy of -1.5 eV. Calculate its
(i) Kinetic energy
(ii) Potential energy
(iii) Wavelength
when the electron makes a transition to the ground state.(Ground state energy = -13.6 eV)
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