A Person Standing in the Street Is Unaware of a Bird

question 56

Multiple Choice

A person standing in the street is unaware of a bird dropping that is falling from a point directly above him with increasing velocity. If the dropping were producing sound of a fixed frequency, as it approaches the person would hear the sound

• A) drop in frequency.
• B) stay at the same frequency.
• C) increase in frequency.
• D) decrease in loudness.
• E) stay at the same loudness.

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Definitions:

Thrombin

An enzyme in blood plasma that causes the clotting of blood by converting fibrinogen to fibrin.

Systole

Contractile phase of the cardiac cycle.

Diastole

Relaxation phase of the cardiac cycle.

Cardiac Cycle

The sequence of events that occurs in the heart during one heartbeat, including contraction (systole) and relaxation (diastole) of the atria and ventricles.