Suppose You Detect a Pulsar That Gives Us 1,000 Radio

question 19

Multiple Choice

Suppose you detect a pulsar that gives us 1,000 radio pulses per second, but the pulsar is in a distant galaxy that is apparently moving away from us at 50 percent of the speed of light. An observer at rest with respect to the pulsar in that faraway galaxy would measure a pulse rate of:

• A) 870 per second
• B) 1,150 per second
• C) 1,250 per second
• D) 1,366 per second
• E) 1,450 per second

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Definitions:

Action Potential

A quick, temporary change in the electrical charge of a cell's membrane, leading to the transmission of nerve impulses.

Gate Control Theory

A theory positing that pain signals encounter nerve gates at the spinal cord level that can block or allow the sensation of pain to travel to the brain.

Lateral Spinothalamic Tract

A pathway in the spinal cord that transmits pain and temperature sensations to the brain.

Anterior Spinothalamic Tract

The anterior spinothalamic tract is a sensory pathway of the spinal cord that carries information about light touch and pressure to the brain.