The Doppler Shift of Ultrasonic Waves Can Measure the Speed

question 75

Multiple Choice

The Doppler shift of ultrasonic waves can measure the speed of blood in an artery.If the frequency of the stationary source is 100 kHz and the reflected sound has a Doppler shift of 200 Hz,what is the blood flow speed? (The speed of sound inside the body is 1 500 m/s. )

• A)1.0 m/s
• B)1.5 m/s
• C)2.2 m/s
• D)3.3 m/s

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Definitions:

Black Magic

Practices of magic that are intended to invoke supernatural powers for malevolent purposes.

Susto

A cultural illness primarily found in Latin America, described as a condition of intense fear believed to stem from a traumatic event causing the soul to leave the body.

Taijin-kyofusho

A Japanese culture-specific syndrome characterized by an intense fear that one's body, body parts, or bodily functions are displeasing or offensive to others.

Amok

A culturally bound syndrome primarily observed in Southeast Asia, characterized by a sudden outburst of violent behavior, often driven by a perceived slight or insult.