Q. The energy absorbed by each molecule (A₂) of a substance is 4.4 × 10⁻¹⁹ J and bond energy per molecule is 4.0 × 10⁻¹⁹ J. The kinetic energy of the molecule per atom will be:
A) 2.2 × 10⁻¹⁹ J
B) 2.0 × 10⁻¹⁹ J
C) 4.0 × 10⁻²⁰ J
D) 2.0 × 10⁻²⁰ J
Explanation
[Solution from source] Energy left after breaking the bond = 4.4 × 10⁻¹⁹ − 4.0 × 10⁻¹⁹ = 0.4 × 10⁻¹⁹ J per molecule. It is shared by the two atoms: 2.0 × 10⁻²⁰ J per atom. 4.0 × 10⁻²⁰ J forgets to divide between the two atoms. Answer (4).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.