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Fast neutrons can easily be slowed down ...

Fast neutrons can easily be slowed down by

A

the use of lead shield

B

passing them through heavy water

C

elastic collision with heavy nucleus

D

applying a strong electric field

Text Solution

AI Generated Solution

The correct Answer is:
To solve the question "Fast neutrons can easily be slowed down by:", we will analyze each of the options provided and determine which one is correct. ### Step 1: Understand the nature of fast neutrons Fast neutrons are high-energy neutrons that can penetrate materials easily. Slowing them down typically involves interactions that reduce their kinetic energy. ### Step 2: Evaluate the options 1. **Lead shield**: Lead is a dense material that is effective at stopping gamma rays and x-rays, but it is not particularly effective for slowing down neutrons. Neutrons can pass through lead without significant interaction. 2. **Passing through heavy water**: Heavy water (D2O) contains deuterium, which has a nucleus that is more effective in slowing down neutrons through elastic collisions. This is a viable option for slowing down fast neutrons. 3. **Elastic collision with heavy nucleus**: While elastic collisions with heavy nuclei can slow down fast neutrons, the effectiveness depends on the type of heavy nucleus. Generally, lighter nuclei (like hydrogen in water) are more effective for slowing down fast neutrons. 4. **Applying a strong electric field**: Neutrons are neutral particles and do not respond to electric fields. Therefore, this option is not valid for slowing down fast neutrons. ### Step 3: Conclusion After evaluating all the options, we find that the best method to slow down fast neutrons is by passing them through heavy water. Thus, the correct answer is: **Answer: Passing through heavy water.** ---
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