Studying a Spectrum from a Star Can Tell Us a Lot.All

question 41

Multiple Choice

Studying a spectrum from a star can tell us a lot.All of the following statements are true except one.Which statement is not true?

• A)The total amount of light in the spectrum tells us the star's radius.
• B)The peak of the star's thermal emission tells us its temperature: hotter stars peak at shorter (bluer)wavelengths.
• C)We can identify chemical elements present in the star by recognizing patterns of spectral lines that correspond to particular chemicals.
• D)Shifts in the wavelengths of spectral lines compared to the wavelengths of those same lines measured in a laboratory on Earth can tell us the star's speed toward or away from us.

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Definitions:

Materials Standards

The set specifications or benchmarks for the quality, quantity, and cost of materials used in manufacturing.

Price Variance

The difference between the actual cost of a product or service and its standard or expected cost, which can indicate issues with budgeting or pricing strategy.

Direct Materials

Raw materials that can be directly traced to the production of a specific product and are a variable cost.

Standard Cost

A predetermined cost of manufacturing a product or performing a service, used as a benchmark for measuring performance.