Hydrogen Lines Are Weak in the Spectra of Hot O-Type

question 59

Multiple Choice

Hydrogen lines are weak in the spectra of hot O-type stars because ____.

• A) most of the hydrogen has been converted to helium
• B) a good spectrum of these stars is difficult to obtain
• C) these stars have no atmosphere
• D) gravitational pressure pushes all the hydrogen lines out of the visible spectrum
• E) most of the hydrogen is ionized to high energy levels

Understand how to make a quadratic expression a perfect square trinomial.

Solve quadratic inequalities.

Identify the effect of parameters on the solutions of a quadratic equation.

Understand the relationship between nominal and real interest rates, including the role of inflation.

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Definitions:

Point Method

A technique used in job evaluation to quantify the value of a job's aspects or components, assigning points based on complexity, skills required, and responsibilities.

Expectancy Theory

A motivation theory suggesting that an individual's willingness to work is based on the expectation that their efforts will lead to desired performance and rewards.

Instrumentality Theory

A concept in motivation theory that suggests the perceived relationship between performance and outcomes affects motivation.

Valued Reward

A tangible or intangible benefit given in recognition of achievement, performance, or service deemed desirable by the recipient.