A shield of material that reflects neutrons is placed around a radioactive sample.

Physics

2 answers:

Tanya [424]3 years ago

4 0

<h3><u>Answer;</u></h3>

A) A chain reaction will be sustained in a sub-critical mass

<h3><u>Explanation</u>;</h3>

Critical mass is the minimum or the smallest amount of a given fissile material necessary to achieve a self-sustaining fission chain reaction under stated conditions.
A subcritical mass is a mass of fissile material that does not have the ability to sustain a fission chain reaction.

nikitadnepr [17]3 years ago

3 0

The answer is A. just took the test

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The final velocity of the wood after the bullet hits is calculated as follows;

$m_1u_1 + m_2 u_2 = m_1v_1 + m_2v_2\\\\0.023(230) + 2(0) = 0.023(170) + 2v_2\\\\5.29 = 3.91 + 2v_2\\\\2v_2 = 1.38\\\\v_2 = \frac{1.38}{2} = 0.69 \ m/s$