Use the Table and the Given X-Ray Absorption Diagrams to Identify

question 98

Short Answer

Use the table and the given X-ray absorption diagrams to identify the composition of each of the regions marked by a letter. The number in each region shows its absorption, and the number on each X-ray beam shows the total absorption for that beam. $$\begin{array} { | l | l | l | l | l | l | l | } \hline \text { Type } & \text { Air } & \text { Water } & \text { Gray matter } & \text { Tumor } & \text { Blood } & \text { Bone } \\\hline \text { Absorption } & 0 & 1,000 & 1,020 & 1,030 & 1,050 & 2,000 \\\hline\end{array}$$ ​ ​ $a = 3100$ , ​ $b = 3070$ ​, $c = 3080$ ​
x =
__________
y =
__________
z =
__________

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Definitions:

Risk-free Security

A financial instrument considered to have minimal risk of default, often equated with the debt of a solvent government or government-backed entity.

Global Minimum-variance Portfolio

A portfolio constructed to achieve the lowest possible risk (variance), holding investments worldwide to diversify exposure.

Efficient Frontier

A graphical representation in modern portfolio theory showing the set of optimal portfolios that offer the highest expected return for a defined level of risk or vice versa.

Firm-specific Risk

The risk associated with an individual company, distinct from market risk, that can affect the company's stock price.