The Age of a Cluster Can Be Determined by

question 106

Multiple Choice

The age of a cluster can be determined by

• A) carrying out a number count of the stars in the cluster.
• B) measuring the cluster's speed of motion relative to the Sun.
• C) determining the turnoff point on the main sequence of the cluster's Hertzsprung-Russell diagram.
• D) observing the cluster's position in the sky with respect to the Sun.

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Definitions:

Average Tax Rate

The proportion of total income that is paid in taxes, calculated by dividing the total amount of taxes paid by the taxpayer's total income.

Marginal Tax Rate

The rate at which the last dollar of income is taxed, indicating how much tax will be paid on an additional dollar of income.

Average Tax Rate

The percentage of total income that is paid as tax, calculated by dividing the total tax amount by the total income.

Marginal Tax Rate

The rate at which the next dollar of taxable income is taxed; refers to the percentage of tax applied to the last dollar earned.