question_answer

The energy absorbed by each molecule \[({{A}_{2}})\] of a substance is \[4.4\times {{10}^{-19}}\,J\] and bond energy per molecule is \[4.0\times {{10}^{-19}}\,J\]. The kinetic energy of the molecule per atom will be [AIPMT (S) 2009]

A)  \[2.0\times {{10}^{-\,20}}\,J\]

B)  \[2.2\times {{10}^{-\,19}}\,J\]

C)  \[2.0\times {{10}^{-\,19}}\,J\] 

D)       \[4.0\times {{10}^{-\,20}}\,J\]

Correct Answer: A

Solution :

KE of molecule = energy absorbed by molecule - BE per molecule

KE per atom