Astronomers Can Tell Whether a Light Source Approaches or Recedes

question 24

Multiple Choice

Astronomers can tell whether a light source approaches or recedes from Earth by

• A)its temperature.
• B)its change in temperature.
• C)its absorption spectra.
• D)the Doppler effect.
• E)all of the above

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Definitions:

Inertia Effect

The tendency of an object or process to continue in its current state, whether at rest or in motion, unless acted upon by an external force.

Cohabitation

The condition of cohabiting and engaging in a sexual relationship without the bond of marriage.

Cohabitants

People in a romantic partnership cohabiting without formal marriage.

Divorced

The state of being legally separated from one’s spouse, following the dissolution of a marriage.