The wave nature of an electron was first given by

If the kinetic energy of an electron is increased by $4$ times,what will be the change in its associated de Broglie wavelength?

The basis of the quantum mechanical model of an atom is:

Show that the circumference of the Bohr orbit for the hydrogen atom is an integral multiple of the de Broglie wavelength associated with the electron revolving around the orbit.

The atomic masses of $He$ and $Ne$ are $4$ and $20 \ amu$,respectively. The value of the de Broglie wavelength of $He$ gas at $-73^{\circ} C$ is $M$ times that of the de Broglie wavelength of $Ne$ at $727^{\circ} C$. $M$ is

Number of waves produced by an electron in one complete revolution in $n^{th}$ orbit is