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Fundamentals Of Physics
Found in: Page 1330
Fundamentals Of Physics

Fundamentals Of Physics

Book edition 10th Edition
Author(s) David Halliday
Pages 1328 pages
ISBN 9781118230718

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Short Answer

A nuclear reactor is operating at a certain power level, with its multiplication factor k adjusted to unity. If the control rods are used to reduce the power output of the reactor to 25% of its former value, is the multiplication factor now a little less than unity, substantially less than unity, or still equal to unity?

The multiplication factor for power output to 25% of its former value remains unity.

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Step by Step Solution

TABLE OF CONTENTS :
TABLE OF CONTENTS

Step 1: Multiplication Factor

The ratio of the number of neutrons for a particular generation of power to the number of neutrons initially for the same power generation is called the multiplication factor.

Step 2: Whether the multiplication factor is less than unity or equal to the unity

The multiplication factor for power output to 25% of its former value remains unity because the control rod provides a reduced number of neutrons. The number of neutrons provided by the control rod completes the deficiency of neutrons due to a reduction in power output.

Therefore, the multiplication factor for power output to 25% of its former value remains unity.

Most popular questions for Physics Textbooks

Verify that the fusion of 1.0 kg of deuterium by the reaction 2H+ 2H→ 3He+n(Q=+3.27MeV) could keep a 100 W lamp burning for 2.5×104y.

The uranium ore mined today contains only 0.72% of fissionable 235U, too little to make reactor fuel for thermal-neutron fission. For this reason, the mined ore must be enriched with 235U. Both role="math" localid="1661753958684" 235U(T1/2=7.0×108y)and 238U(T1/2=4.5×109y) are radioactive. How far back in time would natural uranium ore have been a practical reactor fuel, with a 235U 238Uratio of 3.0%?

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A thermal neutron (with approximately zero kinetic energy) is absorbed by a 238U nucleus. How much energy is transferred from mass-energy to the resulting oscillation of the nucleus? Here are some atomic masses and neutron mass.

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