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NEET-XII-Physics

neet 2020 questions with solutions year:2020

with Solutions -
Qstn# 7 Prvs-QstnNext-Qstn
  • #7
    The energy equivalent of 0.5 g of a substance is:
    (A) `` 4.5 \times 10^{16} J ``
    (B) `` 4.5 \times 10^{13} J ``
    (C) `` 1.5 \times 10^{13} J ``
    (D) `` 0.5 \times 10^{13} J ``
    digAnsr:   B
    Ans : From mass-energy equivalence,
    `` E=mc^{2} ``
    `` =0.5\times 10^{-3}\times 9\times 10^{16} ``
    `` =4.5 \times 10^{13}\,J ``