While Standing at a Crosswalk,you Hear a Frequency of 600

question 45

Multiple Choice

While standing at a crosswalk,you hear a frequency of 600 Hz from an approaching police car.After the police car passes,its frequency is 400 Hz.What is the speed of the police car? (speed of sound = 340 m/s)

• A)34.0 m/s
• B)60.0 m/s
• C)66.3 m/s
• D)68.0 m/s
• E)199 m/s

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Definitions:

Diastolic Pressure

The lower reading in blood pressure measurements; it reflects the pressure in the arteries when the heart rests between beats.

Venous Return

The flow of deoxygenated blood back to the heart via the veins, crucial for maintaining blood circulation throughout the body.

Respiratory Movements

The actions of the respiratory system involved in the inhalation and exhalation of air, facilitating gas exchange between the atmosphere and the body's cells.

Valves

Structures that exist within various types of vessels, including veins and the heart, which maintain the direction of blood flow by opening and closing depending on the pressure gradient.