PHYSICS HIGH SCHOOL

If the velocity of blood flow in the aorta is normally about 0.32 m/s, what beat frequency would you expect if 4.40-MHz ultrasound waves were directed along the flow and reflected from the red blood cells? Assume that the waves travel with a speed of 1540 m/s .

Answers

Answer 1

Answer:

Answer:

The beat frequency is 0.0019 MHz.

Explanation:

Given that,

Velocity = 0.32 m/s

Frequency = 4.40 MHz

Speed of wave = 1540 m/s

We need to calculate the frequency

Case (I),

Observer is moving away from the source

Using Doppler's effect

$f'=(v-v')/(v)f$

Where, v' = speed of observer

Put the value into the formula

$f'=(1540-0.32)/(1540)*4.40$

$f'=4.399\ MHz$

Case (II),

Cell is as the source of sound of frequency f' and it moving away from the observer.

Using formula of frequency

$f''=(v-v_(s))/(v+v_(s))* f$

$f''=(1540-0.32)/(1540+0.32)*4.399$

$f''=4.3971\ MHz$

We need to calculate the beat frequency

$\Delta f= f'-f''$

$\Delta f=4.399-4.3971=0.0019\ MHz$

Hence, The beat frequency is 0.0019 MHz.

Related Questions

A statistic is a(n) __________ that describes groups or samples of objects.observationanalogynumberexperiment
A ball is projected horizontally from the top of a 92.0-meter high cliff with an initial speed of 19.8 m/s. Determine: (a) the horizontal displacement and (b) the final speed the instant prior to hitting the ground.
The yoga term asanas are which of the following?A. The yoga breathing method.B. The yoga term for mediation.C. The yoga term for exercises or poses.D. The yoga term for spiritual enlightenment.
State the relationship between degrees Celsius and kelvins
What is the unit of mu (m) in the equation of Ffriction=miu F formal explan

TRUE OR FALSE? The genetic code is determined by the SIZES of the nitrogen bases.

Answers

False it is not determined by size

Ruff, the 50 cm tall Labrador Retriever stands 3 m from a plane mirror and looks at his image. What is Ruff’s image position and height?

Answers

Since the mirror is plane, the image will be formed behind the mirror. The distance will be the same as that of the distance of the object from the mirror and the height will just be the same.
So, Ruff's image will be 3 m behind the mirror and 50 cm tall.

A 1.00 l sample of a gas at 25.0◦c and 1.00 atm contains 50.0 % helium and 50.0 % neon by mass. what is the partial pressure of the neon. express your answer in atmospheres.

Answers

V = Volume of sample of gas = 1.00 L = 0.001 m³

T = temperature of the gas = 25.0 ⁰C = 25 + 273 = 298 K

P = pressure = 1.00 atm = 101325 Pa

n = number of moles of gas

using ideal gas equation

PV = n RT

101325 (0.001) = n (8.314) (298)

n = 0.041

n₁ = number of moles of helium

n₂ = number of moles of neon

m₁ = mass of helium = n₁ (4) = 4 n₁

m₂ = mass of neon = n₂ (20.2) = 20.2 n₂

given that :

m₁ = m₂

4 n₁ = 20.2 n₂

n₁ = 5.05 n₂

also

n₁ + n₂ = n

5.05 n₂ + n₂ = 0.041

n₂ = 0.0068

mole fraction of neon is given as

mole fraction = n₂ /n = 0.0068/0.041 = 0.166

P₂ = partial pressure of neon = (mole fraction) P

P₂ = (0.166) (1)

P₂ = 0.166 atm

The partial pressure of the neon is 0.16 atm.

Explanation:

A 1.00 l sample of a gas at 25.0◦c and 1.00 atm contains 50.0 % helium and 50.0 % neon by mass. what is the partial pressure of the neon. express your answer in atmospheres.

The partial pressure is the notional pressure of constituent gas if it is occupied alone by the entire volume of the original mixture at the same temperature.

50.0 % helium and 50.0 % neon by mass.

$P = 1 atm$

Mass of the gases = $M$

$Moles of helium = (0.5M)/(4 g/mol)\nMoles of neon = (0.5M)/(20 g/mol)$

By using ideal gas equation we get:

$PV=nRT\nn=(PV)/(RT)=(1.00 L* 1.00 atm)/(0.0820 L atm/mol K* 298 K)=0.0409 mol$

where $n =$ total number of moles of gases

$0.0409 mol=(0.5M)/(4 g/mol)+(0.5M)/(20 g/mol)$

$M = 0.2728 g$

Then we can find the mass and mole of gases

The gas molar volume is the volume of one mole of the gas at a given temperature and pressure.

Mass of helium gas = $(0.2728g)/(2)=0.1364 g$

Moles of helium gas $=n_1=(0.1364 g)/(4 g/mol)=0.0341 mole$

Mass of neon gas $= (0.2728g)/(2)=0.1364 g$

Moles of neon gas $= n_2=(0.1364 g)/(20 g/mol)=0.00682mole$

Partial pressure of the neon gas: $P* \chi_2=P* (n_2)/(n_1+n_2)=1 atm* (0.00682)/(0.00682+0.0341)=0.16 atm$

Therefore the partial pressure of the neon gas is 0.16 atm.

Learn more about pressure brainly.com/question/13897350

#LearnWithBrainly

Solar cells convert what type of energy into electrical energy? A. thermal B. electromagnetic C. chemical D. nuclear

Answers

Answer : The correct option is, (A) thermal

Explanation :

Solar cell is a type of electrical device or p-n junction that converts the light or thermal energy directly into the electrical energy by using the photovalotic effect.

In the process of the energy conversion first require a material that absorbs the solar energy and raise the electron to the higher energy level and then flow of high energy electron to an external circuit. In this energy conversion, the silicon material is used.

Hence, the solar cells convert thermal energy into electrical energy.

Solar cells convert solar energy into electrical energy. Here, solar energy can be included in electromagnetic energy as it includes, visible light, EM radiations which can travel through empty space.

In short, Your Answer would be Option B

Hope this helps!

Scientific knowledge changes when which of the following occurs?A. When knew evidence that challenges old ideas is presented.
B. When scientist decide to change their theories and ideas in response to societal pressure.
C. Scientific knowledge does not change. Once and idea or theory is established it is permanent.

Answers

A. When new evidence that challenges old ideas is presented.

Think about the other choices, they do not make any sense. You cannot change your ideas just because people want something to be a certain way. And you have to change your idea if you're proven wrong.

Answer:

Explanation:it is correct

When a solid compound dissolves in water,a. it breaks up into individual crystals.
b. it always conducts electricity.
c. its particles surround individual water molecules.
d. each of its particles becomes surrounded by water molecules.

Answers

The answer is d. Each of its particles becomes surrounded by water molecules.

Notice that when you dissolve a solid compound in the water, it is no longer visible in or eyes, it mixes in the water, it is because it is being divided into smaller particles and each particles were surrounded by the water molecules.

Other Questions

work of 4 joules is done in stretching a spring from its natural length to 11 cm beyond its natural length. what is the force (in newtons) that holds the spring stretched at the same distance (11 cm)

Who established the 1st college course in radiography for dental students?

sketch a velocity time graph for the motion of the body . from the graph explain each step, calculate the total distance covered by the body

The Hubble telescope’s orbit is 5.6 × 105 meters above Earth’s surface. The telescope has a mass of 1.1 × 104 kilograms. Earth exerts a gravitational force of 9.1 × 104 Newtons on the telescope. The magnitude of Earth’s gravitational field strength at this location is