For the following reaction, the particle ' x ' is ₆^ C ¹¹ ₅^ B ¹¹ + ⁺+ X

Step-by-step solution

The nuclear reaction ₆¹¹ C ₅¹¹ B + ^+ + X requires identifying the unknown particle X by applying conservation laws. Mass number conservation gives 11 = 11 + 0 + A_X , yielding A_X = 0 . Atomic number conservation gives 6 = 5 + 1 + Z_X , yielding Z_X = 0 . The particle with A=0 and Z=0 corresponds to a neutrino. In positron emission, a proton converts to a neutron, positron, and electron neutrino: _Z^A X _ Z-1 ^A Y + ₁^0e + _e . Final answer: B