In an x-ray photoelectron experiment, a photon of wavelength 121 pm ejects an electron from the inner shell of an atom and it emerges with a speed of 56.9 mm s−1 . calculate the binding energy of the electron.

binding energy will be

Explanation:

We have given wavelength of photon

Velocity of light

Plank's constant

So energy of photon

Mass of electron

Velocity of electron is given

So kinetic energy of electron

So binding energy = plank's energy - kinetic energy

So binding energy will be

not too sure thinking all accelerations are pointed down