Question

Radiation from hydrogen discharge tube falls on a cesium plate. Find the maximum possible kinetic energy of the photoelectrons. Work function of cesium is 1.9 eV.

Answer 1

The maximum possible kinetic energy of the photo electrons when radiation from hydrogen discharge tube falls on Cesium tube is 11.7 eV

Explanation:

It is given in the question:

Cesium’s work function = 1.9 eV

Work function of Cesium is denoted by the symbol  ϕ

Then, ϕ = 1.9 eV

The photons energy that comes from the discharge tube is  13.6 eV.

E = 13.6 eV

Let the maximum emission of kinetic energy for the photo electrons be K

From the photoelectric equation of Einstein,

It is understood that the kinetic energy emitted by the photo electrons can be shown as

K = E − ϕ  

Substitute the values of ϕ and E in above equation

K = 13.6 eV − 1.9 eV

K = 11.7 eV.  

The maximum possible kinetic energy of the photo electrons is 11.7 eV

Answer 2

Answer:

Above answer is correct.............