Practice question

ΔE = −GMEm(1r2−1r1). r1 = 5.12×107m, r2 = 1.024×108m. ΔE = −6.67×10−11×6×1024×400(11.024×108−15.12×107). ΔE = −1.601×1017(−9.766×10−9)≈1.56×109J. As per NCERT, applying relevant law/formula with correct units and sign convention leads to 1.6 × 10⁹ J. This satisfies dimensional consistency and physical conditions given, so option B is scientifically correct.