Which of the following forms of hydrogen emits low energy \( \beta^{-} \)particles? (a) Deuteriu...

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Which of the following forms of hydrogen emits low energy \( \beta^{-} \)particles?
(a) Deuterium \( { }_{1}^{2} \mathrm{H} \)
(b) Protium \( { }_{1}^{1} \mathrm{H} \)
(c) Proton \( \mathrm{H}^{+} \)
(d) Tritium \( { }_{1}^{3} \mathrm{H} \)
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