A Tiny Speck (2

question 54

Multiple Choice

A tiny speck (2.0  10^-4 g) of radioactive Americium-241 (241.06 g/mol) is used in smoke detectors. How many atoms of Americium-241 are there in one of these smoke detectors?

• A) 5.0  10¹⁷ atoms
• B) 1.2  10²⁰ atoms
• C) 2.9  10²² atoms
• D) 6.0  10²³ atoms
• E) 8.3  10⁷ atoms

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Spot Rate

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Real Rate

The interest rate adjusted for inflation, reflecting the true cost of borrowing or real yield on an investment.

Inflation Rate

The rate at which the general level of prices for goods and services is rising, and, subsequently, eroding purchasing power.

Spot Rate

The current market price at which a particular currency can be bought or sold for immediate delivery.