A Beam of 1-MeV Gamma Rays Incident on a Piece

question 55

Multiple Choice

A beam of 1-MeV gamma rays incident on a piece of 0.50-cm thick lead is reduced by 50% of its initial value. How thick must the lead be to reduce the beam to one percent of its initial value?

• A) 1.1 cm
• B) 2.2 cm
• C) 3.3 cm
• D) 4.4 cm
• E) 8.4 cm

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Definitions:

Base Year

A specific year against which economic variables are measured and compared in indices or other economic calculations.

Price Index

A measure that examines the weighted average of prices of a basket of consumer goods and services, changing over time to reflect the cost of living.

Inflation

An economic condition characterized by an overall increase in prices and decrease in the purchasing value of money.

Deflation

A decrease in the general price level of goods and services, often indicating a contraction in the amount of money in circulation.