   Chapter 31, Problem 81PE

Chapter
Section
Textbook Problem

Unreasonable ResultsA physicist scatters (rays from a substance and sees evidence of a nucleus 7.5 × 10 − 13 m in radius. (a) Find the atomic mass of such a nucleus. (b) What is unreasonable about this result? (c) What is unreasonable about the assumption?

To determine

(a)

The atomic mass of the nucleus.

Explanation

Given info:

The radius of the nucleus is

r=7.5×1013m

The radius of proton is

ro=1.20×1015m

Formula used:

The relation between atomic mass and radius is

A=(r r o )3

Calculation:

Substituting the values

A=( 7

To determine

(b)

The unreasonable result in mass of nucleus.

To determine

(c)

The cause of unreasonable mass number value

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