The Radial Velocity of a Star or Other Object Is

question 293

Multiple Choice

The radial velocity of a star or other object is measured by:

• A) measuring the change in the angular diameter of the object.
• B) watching the object move compared with the background stars.
• C) measuring the intensity of the light in different regions of the blackbody curve.
• D) observing the Doppler shift of spectral lines in the light from the object.

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Definitions:

Obsessive-Compulsive Disorder

A mental health disorder characterized by persistent, unwanted thoughts (obsessions) and repetitive behaviors (compulsions).

Body Dysmorphic Disorder

A mental disorder characterized by obsessive focus on a perceived flaw in physical appearance that is either minor or not observable to others.

Hoarding Disorder

A psychiatric disorder characterized by a persistent difficulty discarding or parting with possessions, regardless of their actual value.

Posttraumatic Stress Disorder

A psychiatric disorder that may occur in people who have experienced or witnessed a traumatic event, characterized by severe ongoing emotional distress.