While Standing at a Crosswalk,you Hear a Frequency of 590

question 65

Multiple Choice

While standing at a crosswalk,you hear a frequency of 590 Hz from an approaching police car.After the police car passes,its frequency is 440Hz.What is the speed of the police car? (speed of sound = 340 m/s)

• A) 24.8 m/s
• B) 38.3 m/s
• C) 44.7 m/s
• D) 49.5 m/s
• E) ​148.7 m/s

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Definitions:

Nodes

Points on a plant stem where leaves or branches originate; also, junction points in network or circuit.

Myelinated Axon

An axon that is covered with myelin, a fatty substance which increases the speed at which electrical impulses propagate along the nerve fiber.

Action Potentials

Electrical impulses that travel along the membrane of a neuron or muscle cell, enabling communication and response to stimuli.

Radial Symmetry

Having parts arranged around a central axis, like the spokes of a wheel.