Neutron discovered by Jeams Chadwick by striking alpha particle on
(a) Beryllium metal (b) Beryllium and Boron metal
(c) Boron metal (d) Barium metal
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Answer:
A. Beryllium metal
Explanation:
neutron howitzer is a neutron source that emits neutrons in a single direction. It was discovered in the 1930s that alpha radiation that strikes the beryllium nucleus would release neutrons. The high speed of the alpha is sufficient to overcome the relatively low Coulomb barrier of the beryllium nucleus, the repulsive force due to the positive charge of the nucleus, which contains only four protons, allowing for fusion of the two particles, releasing energetic neutrons.
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