Question

Which of the following assumption is correct for a recoil of an atom after photon ejection?

• A. The mass of an atom is very small compared to mass of the ejected photon.
• B. The mass of an atom is very large compared to mass of the ejected photon.
• C. The electron is considered to be in second excited state.
• D. After the ejection, photon and atom move in same direction.

Answer 1

The correct option is A The mass of an atom is very small compared to mass of the ejected photon.

The speed with which the atom gets recoiled on the ejection of a photon is known as a recoil speed. The mass of an atom is very small compared to mass of the ejected photon. The electron is considered to be in the first excited state.