The Light from a Distant Cloud of Gas and Dust

question 283

Multiple Choice

The light from a distant cloud of gas and dust looks distinctly red to the unaided eye. When a spectrum is taken, the red color is found to come from a single, bright spectral line. Thus, the red color in this situation is due to

• A) interstellar reddening.
• B) the Balmer spectrum of hydrogen.
• C) the Doppler effect.
• D) interstellar reddening, the Balmer spectrum of hydrogen, or the Doppler effect.

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Definitions:

Flooding Technique

A behavioral therapy method where an individual is exposed to their fear source without an actual threat in order to overcome that fear.

Tolerating Flooding

Tolerating Flooding refers to a therapeutic technique where individuals are exposed to a vast amount of the anxiety-inducing stimulus in order to diminish the fear response over time.

Acquisition Training

The process of learning new behaviors or knowledge, especially through reinforcement.

Extinction

In conditioning, it refers to the gradual weakening and eventual disappearance of a conditioned response when the conditioned stimulus is no longer paired with the unconditioned stimulus.