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

The mass of an electron is $9.1 \times 10^{-31} \ kg$. If its $K.E.$ is $3.0 \times 10^{-25} \ J$,calculate its wavelength.

What is the de Broglie wavelength of an electron in the $2^{nd}$ orbit of a hydrogen atom?

Which of the following has the lowest de Broglie wavelength $\lambda$?

The ratio of de Broglie wavelengths of two particles,having mass ratio $1 : 3$ and kinetic energy ratio $2 : 1$ is

The wavelength of the electron emitted by a metal sheet of work function $4 \ eV$ when photons from $EMR$ of wavelength $124 \ nm$ strike the metal plate is ........... $nm$.