In an experiment, a student found that a maximum wavelength of 351 nm is needed to just dislodge electrons from a metal surface. calculate the velocity (in m/s) of an ejected electron when the student employed light with a wavelength of 313 nm.

Explanation:

As we know that the maximum wavelength needed to remove the electron from metal surface is given as

so we have work function of metal is given as

Now as per Einstein's equation for photo electric effect we know that

chemical properties of thing

what experimental evidence led scientists to change from the previous model to this one?

a few of the positive particles aimed at a gold foil seemed to bounce back.

the colors of light emitted from heated atoms had very specific energies.

experiments with water vapor showed that elements combine in specific proportions.

cathode rays were bent in the same way whenever a magnet was brought near them.