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2 years ago

Which property best makes radio waves safe for diagnosing illnesses through magnetic resonance imaging?

Physics

2 answers:

77julia77 [94]2 years ago

8 0

Answer:

1) Long energy of radio waves

2) long wavelengths of radio waves

Explanation:

aleksandrvk [35]2 years ago

4 0

Answer:

It is used in MRI because it does not damage cells

Radio waves are used for space research because they have very long wavelengths

Explanation:

Many parts of the electromagnetic spectrum are applied in clinical diagnosis and treatment of illnesses. However, these highly ionizing radiation damage cells and its dosage must be carefully managed to avoid creating radiation related health problems for the patients.

Radio waves can be used in MRI without issues because the energy of the radiation is not sufficient to cause damage to cells but is sufficient to provide images for the sake of medical diagnosis.

Secondly, radio waves have long wavelength. This property is suitable for long range

communication. Hence it can be used in space research

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During chemistry class, Carl performed several lab tests on two white solids. The results of three tests are seen in the data ta

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Answer: it’s c) ionic

Explanation:

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1 year ago

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A toy rocket engine is securely fastened to a large puck that can glide with negligible friction over a horizontal surface, take

Ad libitum [116K]

Answer:

$F=(3i+3.6j)\ N$

Explanation:

It is given that,

Mass of the puck, m = 4.8 kg

Initial velocity of the puck, $u=(1i+0j)\ m/s$

After 8 seconds, final velocity of the puck, $v=(6i+6j)\ m/s$

Let the x and y component of force is given by $F_x\ and\ F_y$ .

x component of force is given by :

$F_x=m\times \dfrac{v-u}{t}$

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$F_x=3\ N$

y component of force is given by :

$F_y=m\times \dfrac{v-u}{t}$

$F_y=4.8\times \dfrac{6-0}{8}$

$F_y=3.6\ N$

So, the component of the force is $F=(3i+3.6j)\ N$ . Hence, this is the required solution.

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2 years ago

The lightest duty and most widely used non flexible metal conduit is

Alenkinab [10]

Aluminium, or heavier version copper.

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1 year ago

Nerve impulses are carried along axons, the elongated fibers that transmit neural signals. We can model an axon as a tube with a

jeka94

Answer:

The resistance of the axon is $1.27\times 10^7\ \Omega$ .

Explanation:

Given that,

Inner diameter of the model of an axon, $d=10\ \mu m$

Radius of the model, $r=5\ \mu m=5\times 10^{-6}\ m$

Resistivity of the fluid inside the tube wall, $\rho=0.5\ \Omega -m$

Length of the axon, l = 2 mm = 0.002 m

We know that the resistance in terms of resistivity of an object is given by :

$R=\rho\dfrac{l}{A}\\\\R=0.5\times \dfrac{0.002}{\pi (5\times 10^{-6})^2}\\\\R=1.27\times 10^7\ \Omega$

So, the resistance of the axon is $1.27\times 10^7\ \Omega$ . Hence, this is the required solution.

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2 years ago

If a key is pressed on a piano, the frequency of the resulting sound will determine the ________, and the amplitude will determi

MakcuM [25]

Answer:

If a key is pressed on a piano, the frequency of the resulting sound will determine the ___PITCH_____, and the amplitude will determine the _____LOUDNESS___ of the perceived musical note.

Explanation:

The frequency of a vibrating string is primarily based on three factors:

The sounding length (longer is lower, shorter is higher)

The tension on the string (more tension is higher, less is lower)

The mass of the string, normally based on a uniform density per unit length (higher mass is lower, lower mass is higher)

To make a shorter string (such as in an upright piano) sound the same fundamental frequency as a longer string (such as in a 9' grand piano), either the thickness of the string must be increased (which increases the density and the mass) or the tension must be decreased, and usually it's a bit of both.

Thicker strings are often stiffer and that creates more inharmonic partials, and lower tension is associated with other problems, so the best way to make a string sound lower is the make it longer, but it is not practical to make a piano from strings that are all the same density and tension, because the lowest strings would have to be ridiculously long. Nine feet is already a great demand on space for a single musical instrument, and of course those pianos are extremely expensive and difficult to move.

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Many things can influence the amplitude.

What is producing the sound?

How far are you from the source of the sound? The farther away the smaller the amplitude.

Intervening material. Sound does not travel through walls as well as air.

Depends on what is detecting the wave sound. Ear vs. microphone.

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1 year ago

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