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Q. A cyclotron is used to accelerate protons $\binom{1 H}{1}$, Deuterons $\binom{2 H}{1}$ and $\alpha$-particles $\binom{4 He}{2}$. While exiting under similar conditions, the minimum K.E. is gained by

KCETKCET 2020

Solution:

K.E. $=q^{2} / m$
Hence, a deuteron gains the least kinetic energy.