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k0ka [10]
3 years ago
12

39

Physics
1 answer:
Likurg_2 [28]3 years ago
5 0
Noble gasses.

alkali metals (the first column of elements), alkaline earth metals (the second column of elements), halogens (the next-to-last column of elements), and noble gases (the last column of elements).
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The average distance between collisions for atoms in a real gas is known as the mean free path (see pp. 298-9 in McKay). Which o
dusya [7]

Answer:

300 nm

Explanation:

R = Gas constant = 8.314 J/molK

r = Atomic radii = 1\times 10^{-10}\ m

d = Atomic diameter = 2r=2\times 10^{-10}\ m

At STP

T = Temperature = 273.15 K

P = Pressure = 100 kPa

N_A = Avogadro's number = 6.022\times 10^{23}

The mean free path is given by

\lambda=\frac{RT}{\sqrt2d^2N_AP}\\\Rightarrow \lambda=\frac{8.314\times 273.15}{\sqrt2 \pi \times (2\times 10^{-10})^2\times 6.022\times 10^{23}\times 100000}\\\Rightarrow \lambda=2.12165\times 10^{-7}\ m=212.165\times 10^{-9}\ m=212.165\ nm

The answer that best represents the mean free path for gas molecules is 300 nm

4 0
3 years ago
In 1991 at smith college, in massachusetts, ferdie adoboe ran 1.00 × 102 m backward in 13.6 s. suppose it takes adoboe 2.00 s to
Alik [6]

as it is given that it covers a total distance 1 * 10^2 m

total time taken by it = 13.6 s

now the average speed is given as ratio of total distance and total time

v = \frac{d}{t}

v = \frac{1* 10^2 }{13.6}

v = 7.35 m/s

so the average speed will be 7.35 m/s

now if it starts from rest and achieve the final speed as 7.35 m/s

now we can use kinematics

v_f = v_i + at

7.35 = 0 + a* 2

a = 3.68 m/s^2

so its acceleration will be 3.68 m/s^2

4 0
4 years ago
what optical properties do holograms depend on? Please give explanations for answers and/or sources please! I need this for my s
Stels [109]

A hologram is a physical structure that diffracts light into an image. The term ‘hologram’ can refer to both the encoded material and the resulting image.  A holographic image can be seen by looking into an illuminated holographic print or by shining a laser through a hologram and projecting the image onto a screen. Hope this helps! Oh and here's a good source to use just don't forget to credit the sources you use.

http://file.scirp.org/Html/70316_70316.htm

7 0
4 years ago
What's manifestation​
TiliK225 [7]

Answer:

Explanation:

the action or fact of showing an abstract idea.


(◑.◑)!

8 0
2 years ago
Read 2 more answers
The sum of potential and kinetic energies in the particles of a substance is called energy. True or False
harina [27]
<h2>Answer: False</h2>

Explanation:

This sentence is the description of the mechanical energy.

In this sense, the mechanical energy of a body or a system is that which is obtained from the speed of its movement (kinetic energy) or its specific position (potential energy), in order to produce a mechanical work.

That is to say: The mechanical energy involves both the kinetic energy and the potential energy (which can be elastic or gravitational, for example).

In addition, it should be noted that mechanical energy is<u> conserved in conservative fields and is a scalar magnitude.</u>

Therefore:

<h2>The sum of potential and kinetic energies in the particles of a substance is called  <u>Mechanical Energy</u></h2>
7 0
4 years ago
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