Question

For fission to take place, neutrons must have:

• A. very very low energy
• B. thermal energy
• C. very high energy
• D. no kinetic energy

Hint:

Thermal neutrons have kinetic energies around 0.025 eV at room temperature.

Answer 1

The Correct Option is B

In nuclear fission, slow-moving (thermal) neutrons are more likely to be captured by heavy nuclei such as \( ^{235}U \), initiating a chain reaction. Fast neutrons need to be moderated to thermal energies to sustain fission reactions efficiently.