You Measure the Rotation Rate and Apparent Brightness of a Spiral

question 116

Multiple Choice

You measure the rotation rate and apparent brightness of a spiral galaxy. What should you use to determine its distance?

• A) its angular diameter
• B) the Hubble law
• C) the Tully Fisher relationship
• D) the period-luminosity relation

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Definitions:

Variation

The degree to which data points in a statistical distribution or dataset differ from each other and from the mean of the set.

Specification Limits

Pre-determined upper and lower bounds within which a product or process's performance is considered acceptable.

Standard Deviations

An indicator of the degree of spread or variability in a collection of data points, showing how much the values differ from the average.

Sample Proportion

An estimate of the proportion within the entire population that possesses a particular attribute, derived from a subset of the population.