$A$ device used for the measurement of radioactivity is

  • A
    Mass spectrometer
  • B
    Cyclotron
  • C
    Nuclear reactor
  • D
    $G.M.$ counter

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Which of the following statements is correct?

Of the following radiations,the one most easily stopped by air is

$A$ radioisotope will not emit

Tritium,a radioactive isotope of hydrogen,emits which of the following particles?

During the emission of a $\beta$-particle,what happens to the nucleus?

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