Published by:
CGP EDU Academic Team
Published on: September 12, 2026
Thermal neutrons can cause fission in
A
B
C
D
Text Solution
Verified by ExpertsThe correct answer is:
A
Step 1: Understand that thermal neutrons are low-energy neutrons that can readily induce fission in certain isotopes.
Step 2: Among the provided options, only \( U^{235} \) is known for being capable of fission when struck by thermal neutrons. This means it has a high probability of capturing these neutrons and subsequently undergoing fission.
Step 3: \( U^{238} \) primarily requires fast neutrons to undergo fission, while the others (\( Pu^{238} \) and \( Th^{232} \)) have different fission characteristics and often require neutrons of different energies.
Therefore, the correct answer is A: \( U^{235} \).
Step 2: Among the provided options, only \( U^{235} \) is known for being capable of fission when struck by thermal neutrons. This means it has a high probability of capturing these neutrons and subsequently undergoing fission.
Step 3: \( U^{238} \) primarily requires fast neutrons to undergo fission, while the others (\( Pu^{238} \) and \( Th^{232} \)) have different fission characteristics and often require neutrons of different energies.
Therefore, the correct answer is A: \( U^{235} \).
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