What frequency does the blood receive? What frequency return

Thank you!In summary, the conversation discusses the use of ultrasound to measure the speed of blood flow in human tissue. It involves mixing the original frequency of 2.41 MHz with the reflected frequency from the moving bloodstream at 28.7 cm/s to produce beats. By using the equations f(observed) = f(s) x (Vw / Vw +/- Vs) and f(observed) = f(s) x (Vw +/- V(obs)) / Vw, the frequency received by the blood is 2.410449 MHz, the frequency returning to the source is 2.410948 MHz, and the beat frequency produced is 948 Hz.
  • #1
CMATT
32
1

Homework Statement


Ultrasound reflected from an oncoming bloodstream that is moving at 28.7 cm/s is mixed with the original frequency of 2.41 MHz to produce beats. Use the speed of sound in human tissue as 1540 m/s. Assume that the frequency of 2.41 MHz is accurate to seven significant figures. (Hint: compare to Example 17.8 in OpenStaxCollege Physics.)

a) What frequency does the blood receive? (Give an answer in MHz, to 7 significant figures.)

b) What frequency returns to the source? (Give an answer in MHz, to 7 significant figures.)

c) What beat frequency is produced if the source and returning frequencies are mixed? (Give an answer in Hz, to 3 significant figures.)

Homework Equations



f(observed) = f(s) x (Vw / Vw +/- Vs)

f(observed) = f(s) x (Vw +/- V(obs)) / Vw

The Attempt at a Solution



a)
(2,410,000 Hz)(1540 m/s + .287 m/s) / 1540 m/s) = 2410449.136 Hz = 2.410449 MHz

b)
(2410449 Hz)(1540 / 1540 - .287) = 2410948.313 Hz = 2.410948 MHz

c) 2410948.313 - 2410000 = 948 Hza) is correct, I got that one right. b) and c) are wrong. I thought I did them correctly. Could someone please help?
Thank you!
 
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  • #2
NEVERMIND! I solved it
 

1. What is the frequency at which blood receives oxygen?

The frequency at which blood receives oxygen varies depending on the individual's respiratory rate and the efficiency of their lungs. On average, a healthy adult at rest takes about 12-20 breaths per minute, meaning their blood receives oxygen around 12-20 times per minute. However, during physical activity or at higher altitudes, the frequency may increase to meet the body's oxygen demands.

2. How does the frequency of blood receiving oxygen affect overall health?

The frequency of blood receiving oxygen is crucial for maintaining overall health. Oxygen is necessary for cellular respiration, which provides energy for our body's functions. If the frequency is too low, it can lead to hypoxemia, a condition where there is not enough oxygen in the blood. This can cause fatigue, shortness of breath, and other health issues. On the other hand, too high of a frequency can indicate hyperventilation, which can also have negative effects on the body.

3. Does the frequency at which blood receives oxygen change with age?

Yes, the frequency at which blood receives oxygen can change with age. As we age, our lung function and respiratory rate may decrease, resulting in a lower frequency of oxygen delivery to the blood. This is one reason why older adults may experience shortness of breath during physical activity and may be at a higher risk for respiratory conditions.

4. What is the frequency at which blood returns to the heart?

The frequency at which blood returns to the heart varies depending on the individual's heart rate. On average, a healthy adult's heart rate is around 60-100 beats per minute, meaning their blood returns to the heart at a similar frequency. However, during physical activity or in times of stress, the heart rate may increase, resulting in a higher frequency of blood returning to the heart.

5. How does the frequency of blood return to the heart affect overall health?

The frequency of blood return to the heart is essential for maintaining overall health. The heart is responsible for pumping oxygen-rich blood to the body's tissues and organs, providing them with the necessary nutrients and removing waste products. If the frequency is too low, it can lead to inadequate blood flow and oxygen delivery, which can result in fatigue, dizziness, and other health issues. On the other hand, if the frequency is too high, it can put strain on the heart, leading to potential heart problems.

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