The laser pointer emits light because electrons in the material are excited (by a battery) from their ground state to an upper excited state. when the electrons return to the ground state, they lose the excess energy in the form of 537-nm photons. what is the energy gap between the ground state and excited state in the laser material?

E= 3.497×10^(-19) J

Explanation:

The energy gap between ground and the excited state will be equal to energy of a photon of wavelength 537 nm

which can be calculated as

h= Planck's constant

λ= wavelength of photon

c= speed of light

E= 3.497×10^(-19) J

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