A Reflection Nebula Is Made Visible by

question 86

Multiple Choice

A reflection nebula is made visible by

• A) thermal energy emitted as a continuous spectrum by very hot gas,much like that emitted by a hot body on Earth.
• B) blue light,preferentially scattered by tiny dust grains.
• C) emission lines from hydrogen,which itself has been ionized by UV light from embedded stars.
• D) light from embedded stars,reflected over a wide range of wavelengths toward Earth by crystals of water.

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Definitions:

Actual Costs

Expenditures that a company incurs, as opposed to estimations or budgeted amounts.

Standard Costs

Predetermined costs for material, labor, and overhead used as benchmarks for measuring performance.

Direct Labor Time Variance

The difference between the actual hours spent on production and the standard hours expected, multiplied by the standard hourly wage rate.

Actual Costs

are the genuine expenditures incurred in the production or acquisition of goods and services, as opposed to estimated or standard costs.