Practice question

E = −GMEm2r. r = 8RE = 5.12×107m. E = −6.67×10−11×6×1024×6002×5.12×107. E = −2.401×10171.024×108≈−2.34×109J. As per NCERT, applying relevant law/formula with correct units and sign convention leads to -2.4 × 10⁹ J. This satisfies dimensional consistency and physical conditions given, so option C is scientifically correct.