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marta [7]
3 years ago
6

A flap of tissue that prevents blood from flowing back is a(n)________ .

Physics
1 answer:
ioda3 years ago
6 0
A valve is a flap of tissue that prevents blood from flowing back
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An animal cell placed in pure distilled 100% will
jasenka [17]

in a hypotonic solution like distilled water, a red blood cell would burst, because inside the cell has a higher solute concentration than outside.

In a hypertonic solution, there is a higher solute concentration on the outside of the cell than on the inside, causing the cell to shrivel.

i hope this helps

8 0
3 years ago
what frequency of light must an electron in hydrogen absorb to jump from the n=2 state to the n=5 state? (a) 2.86 Hz (b) 4.08 Hz
Ostrovityanka [42]

Answer:

(c) 6.91x10^14 Hz

Explanation:

Find the level energy of n=2 and n=5, using  the formula:

E = -E_0/n^2

where  E_0=13.6eV

E_2 =\frac{-13.6}{2^2}=-3.4eV

E_5 =\frac{-13.6}{5^2}=-0.544eV

To jump from n=2 to n=5 the electron absorbs a photon with energy equal to (-0.544) - (-3.4)=2.856eV, using the next formula to find specific wavelength \lambda to that energy

E = hc/\lambda

Where c is the speed of light (c=3 \times10^8m/s) and h is Planck's constant (h=4.14\times10^{-15}eVs). Solve for \lambda:

E = hc/\lambda\\\lambda E = hc\\\lambda = \frac{hc}{E} \\\lambda = \frac{(4.14\times10^{-15})(3 \times10^8)}{2.856}=4.35\times10^{-7}m

The frequency of this wavelength is calculated with this formula:

f=\frac{c}{\lambda}

f=\frac{3\times10^8}{4.3487\times10^{-7}} =6.89\times10^{14}Hz\approx6.9\times10^{14}Hz

8 0
4 years ago
How to find input force ​
vfiekz [6]

Answer: Calculate the work input in a pulley by using the previous readings in the correct mathematical equation. : Work (W) equals force (f) multiplied by distance (d), or W=fd. The work done by the pulley is the equation of weight (w) multiplied by height traveled (h).

Explanation:

6 0
3 years ago
What are atoms of the same element with different numbers of neutrons called?
Andrei [34K]

Answer:

These are called isotopes.

Explanation:

Please mark brainliest and have a great day!

6 0
3 years ago
How does the temperature of the Earth’s mantle compare to the other layers of the Earth?
marta [7]
Its not a A  or B cause the core is the hottest.      Its not D either the answer is D
4 0
4 years ago
Read 2 more answers
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