An atom in the ground state has a collision with an electron, then emits a photon with a wavelength of 1240 nm. What conclusion can you draw about the initial kinetic energy of the electron

attached below is the free body diagram of the missing  illustration

Initial kinetic energy of the electron = 3 eV

Explanation:

The conclusion that can be drawn about the kinetic energy of the electron is

E = initial kinetic energy of the electron

E = -4 eV

E = -1 eV

insert the values into the equation above

= -1 -(-4)  eV

   = -1 + 4 = 3 eV

temp rises, and expansion