How Are Rotation Curves of Spiral Galaxies Determined Beyond Radii

question 63

Multiple Choice

How are rotation curves of spiral galaxies determined beyond radii where starlight can be detected?

• A)by extrapolation
• B)through observations of the 21 cm line of atomic hydrogen
• C)through observations of spectral lines of dark matter
• D)by watching the galaxies rotate over a period of years
• E)by measuring the broadening of absorption lines

Relate concepts of normal distribution to standardized scores (z-scores) and their applications in testing and assessments.

Understand the concept and characteristics of the normal distribution.

Recognize the properties of the standard normal distribution.

Comprehend the relationship between sample size and its resemblance to a normal distribution.

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Definitions:

Unstructured Interviews

A method of interviewing where questions are not prearranged, allowing for a more free-form and adaptable conversation.

Directive Leadership Style

A leadership approach where the leader takes a highly authoritative role, making decisions unilaterally and expecting subordinates to follow instructions without much input.

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A leadership approach focusing on identifying and maximizing the strengths of team members rather than fixing their weaknesses.

Transformational Leadership

A leadership style that inspires and motivates followers to exceed their own self-interests for the good of the organization, often by emphasizing vision, values, and ethical standards.