From kinetic theory, tell the dimension of an atom.
The ratio of the speed of the electrons in the ground state of hydrogen to the speed of light in vacuum is
A $10\; kg$ satellite circles earth once every $2 \;hours$ in an orbit having a radius of $8000\; km$. Assuming that Bohr's angular momentum postulate applies to satellites just as it does to an electron in the hydrogen atom, find the quantum number of the orbit of the satellite.
$X$-rays incident on a material
Explain the formulas of energy of electron in atom revolving around the nucleus in different orbits.
Orbital acceleration of electron is
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