Question

In the nuclear reaction,²²⁸Th → ²²⁴Ra + α atomic mass of ²²⁸Th is 228.0287 u ²²⁴Ra is 224.0202 u ⁴He is 4.0026 u

What is Q value of reaction (approximately).

(A) 5.49 MeV 

(B) 4.95 MeV 

(C) 5.9 MeV 

(D) 7.36 MeV

Answer 1

Correct Answer is: (A) 5.49 MeV 

Q = (m_Th – m_Ra – m_α ) × c²

= 5.49 MeV