The energy required to break one bond in $DNA$ is $10^{-20}\, J.$ This value in $eV$ is nearly

  • [NEET 2020]
  • A

    $0.006$

  • B

    $6$

  • C

    $0.6$

  • D

    $0.0625$

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An electron and a proton are detected in a cosmic ray experiment, the first with kinetic energy $10\; keV$, and the second with $100\; keV$. Which is faster, the electron or the proton? Obtain the ratio of their speeds. (electron mass $=9.11 \times 10^{31}\; kg$. proton mass $=1.67 \times 10^{-27}\;$$ kg , 1 \;eV =1.60 \times 10^{-19} \;J )$