from the surface of the metal. Increasing the intensity of the light increases the number of electrons but not their energy and so will lead to an increase in the number of electrons escaping but not to an increase in their energy The kinetic energy of the ejected electron is mv2/2. where m is the mass of the electron and v is the velocity, we may write an equation for the energy balance in the experiment: hv=A+mv2/2(2)where A is an energy characteristic of the metal surfacefrom the surface of the metal. Increasing the intensity of the light increases the number of electrons but not their energy and so will lead to an increase in the number of electrons escaping but not to an increase in their energy. The kinetic energy of the ejected electron is mv2 /2, where m is the mass of the electron and v is the velocity, we may write an equation for the energy balance in the experiment: h = A + mv2 /2 (2) where A is an energy characteristic of the metal surface