Fundamentals of Physics
Fundamentals of Physics
10th Edition
ISBN: 9781118230732
Author: David Halliday
Publisher: WILEY
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Chapter 43, Problem 1Q
To determine

To find:

(a) the number that goes into the elevated box (superscript) in the given nuclear reaction.

(b) the number that goes into the descended box (value of Z) in the given nuclear reaction.

Expert Solution & Answer
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Answer to Problem 1Q

Solution:

(a) The number that goes into the elevated box (superscript) in the given nuclear reaction = 42

(b) The number that goes into the descended box (value of Z) in the given nuclear reaction = 101

Explanation of Solution

Given:

i. A nuclear reaction 235U + n   Fundamentals of Physics, Chapter 43, Problem 1Q , additional homework tip  1 132Sn + + 3n .

ii. Refer to Appendix F and G of the textbook to know about A and Z of elements.

Concept

In any nuclear reaction, A and Z has to be conserved.

In the given reaction, balance A and Z on both sides of the reaction, because these numbers of conserved.

Let us say that the unknown nucleus ‘unknown’ has A=X and Z = Y

235U + n   Fundamentals of Physics, Chapter 43, Problem 1Q , additional homework tip  2 132Sn + unknownYX + 3n

(a)

On the left-hand side:

A = 235+1 = 236 ………………………………………………(1)

Z = 92 +0 = 92 …………………………………………………(2)

On the right-hand side:

A = 132 + X+ 3 = 135 + X ……………………………………..(3)

Z = 50 + Y + 0 = 50+ Y  ………………………………………..(4)

Comparing eqn (1) and eqn (3) we can calculate that

X = 236 – 135 = 101

(b)

Comparing eqn (2) and (4) we can calculate that

Y = 91 – 50 = 42

From Appendix F and G, we can say that the ‘unknown’ element is Molybdenum Mo.

We can now write the complete nuclear reaction as

235U + n   Fundamentals of Physics, Chapter 43, Problem 1Q , additional homework tip  3 132Sn + Mo42101 + 3n

Conclusion

We can complete a given nuclear reaction by calculating A and Z of elements on both the sides of the reaction.

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