An ultrasound unit is being used to measure a patient's heartbeat by combining the emitted 2.0 MHz signal with the sound waves reflected from the moving tissue of one point on the heart. The beat frequency between the two signals has a maximum value of 560 Hz . What is the maximum speed of the heart tissue? The speed of ultrasound waves in human tissue is 1540 m/s.Express your answer to two significant figures and include the appropriate units.
Answers
for this question we have:
Signal 2.0 MHz = Emitted so we can call it
and we need the Reflected =
In this question, we have a source which goes to the heart and a reflected which comes back from the heart and we need the speed of the reflected.
So you should know that the speed of reflected is lower than the source(Emitted).
we also know: ΔBeat frequency(max) = 560 Hz =
so we have:
so frequency of Reflected is:
2.0 × 10^6 Hz - 560 Hz = 1.99 × 10^6 Hz =
now you know that Lambda = v/f
so if we find the lambda with our Emitted then we can find v with the Reflected:
Lambda = 1540(m/s) / 2.0 × 10^6 Hz = 7.7 × 10^-4 m
=>
=> 7.7 × 10^-4m (1.99 × 10^6Hz) = 1532 m/s
so the
This question is solved by two top teachers as fast as they could :))
I hope this is helpful
have a nice day
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If a particular atom of an element has five protons a neutral atom of this element would have ________ electrons. A. 0 B. 3 C. 5 D. 8
Answers
Answer:
The answer is
84.9 kPa
Explanation:
Using Boyle's law to find the final pressure
That's
where
P1 is the initial pressure
P2 is the final pressure
V1 is the initial volume
V2 is the final volume
Since we are finding the final pressure
From the question
P1 = 115 kPa
V1 = 480 mL
V2 = 650 ml
So we have
We have the final answer as
84.9 kPa
Hope this helps you
False
Answers
Answer: The given statement is false.
Explanation:
In industries water is used for many purposes like washing, cooling, fabricating, diluting etc.
Therefore, huge amount of water is used by industries and also waste water or non-consumptive water is thrown by industries into rivers, sea, lakes etc.
An industry can avoid the unnecessary usage of water in various process so that water can be conserved as water is a precious resource of nature.
Therefore, the statement since 40 percent of industrial water use is non-consumptive, there is little that industry can do to conserve even more water, is false.
The answer isFALSE.
Not true
c. Modern view
b. Earth-centered
d. all of the above are solar system models
Answers
Correct answer choice:
B. Earth-centered
Explanation:
Heliocentric theory is the planetary model in which the Earth and planets rotate around the Sun at the focus of the Solar System. Historically, Heliocentric theory was objected to geocentric theory, which set the Earth at the core. This approach was explained in sections by several cosmologists over various times, particularly Aristarchus, Copernicus, Kepler, and Galileo.
Answer:
The correct answer is option b, Earth centered
Explanation:
For the very first it was proposed by Copernicus that it is not the earth but sun which lies at the center of the system and rest all planets revolve around the sun. This sun centered model is known as heliocentric system and is also referred to as the modern view. This model was also helpful in solving two major queries instantly –
a) Varying brightness of planets
b) Retrograde motion.
b. The larger one accelerates at 3.33 m/s2, while the smaller one accelerates at 100 m/s2.
c. The larger one accelerates at 100 m/s2, while the smaller one accelerates at 3.33 m/s2.
d. The ...
Answers
Answer:
B) The larger one accelerates at 3.33 m/s² while the smaller one accelerates at 100 m/s².
Explanation:
Parameters given:
Mass of larger asteroid = 3000 kg
Mass of smaller asteroid = 100 kg
Force of collision = 10000 N
Since both of them experience the collision force, we can find how that force causes them to accelerate by using the formula of force:
F = m*a
=> a = F/m
For the larger one,
a = 10000/3000 = 3.33 m/s²
For the smaller one,
a = 10000/100 = 100 m/s²
F = M A
A = F / M
If a 10,000N net force acts on a 3,000 kg object, then the object's
acceleration is (10,000N / 3,000kg) = 3-1/3 m/s² for as long as the
force on it persists, and zero after that.
If a 10,000N net force acts on a 100 kg object, then the object's
acceleration is (10,000N / 100kg) = 100 m/s² for as long as the
force on it persists, and zero after that.
Those appear to be the numbers in choice-b, but the description
of the event and the situation is misleading.
B) liquid phase
C) solid, liquid and gas phases
D) no phases are present at this point
Answers
Answer:
The answer is C) solid, liquid and gas phases
Explanation:
This point is called the triple point bc solid, liquid, and gas phases can exist together.
hope this helps :)
B) they would not be able to see anything outside the window.
C) lasers can not be transmitted through the vacuum of space.
D) the sound of the explosion would not be transmitted back to their ship.
Answers
Answer:
D. the sound of the explosion would not be transmitted back to their ship.
Explanation:
Sound is a type of mechanical wave so it needs a solid to move through. Since space is a vacuum, the Klingon crew would not be able to hear the explosion.