Question

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

Answer 1

Answer:

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

$E_{e} = E_{3} - E_{1}$

E$_{e}$ = initial kinetic energy of the electron

E$_{1}$ = -4 eV

E$_{3}$ = -1 eV

insert the values into the equation above

$E_{e}$ = -1 -(-4)  eV

   = -1 + 4 = 3 eV