Calculate the de-Broglie wavelength associated with electron in a metal at `27^@C`

What is the de Broglie wavelength

Calculate the de Broglies wavelength associated with the electron revolving in the first excited state of hydrogen atom. The ground state energy of the hydrogen atom is -13.6 eV.

Calculate de Broglie’s wavelength associated with an electron moving with a velocity equal to l/10th that of light.

Calculate de Broglie's wavelength associated with an electron moving with a velocity equal to 1//10th of light.

Calculate de Brogile wavelength associated with an electron moving with a velocity of 10^(7) ms^(-1) .

Compute the typical de-Broglie wavelength of an electron in a metal at 27^@C and compare it with the mean separation between two electrons in a metal which is given to be about 2xx10^-10m .

Calculate the de-Brogile wavelength of an electron.