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valentina_108 [34]
3 years ago
9

The geocentric theory states that the center of the universe is

Physics
1 answer:
lilavasa [31]3 years ago
8 0

i sorry i thought of geocentric as something else it appears that the earth was the center

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If the radius of silver is 0.144 nm, what is the PD of the (100) plane for silver in m-2?
Brrunno [24]

Before going to solve this question first we have to understand planar density of a crystal lattice.

Planar density of a plane is given defined-

                                                 PD=\frac{N}{V}

Where N is number of atoms centred in the plane and A is the area of the plane.

As per the question we have been given silver.

We know that silver is a face centered cubic crystal. i.e FCC

The radius of silver [r] is given as 0.144 nm.

1 nm=10^{-9} m.

Hence radius r =0.144*10^{-9} m

We have to calculate the PD of [100] plane of silver.

The area of [100] FCC is 8r^2 where r is the radius silver.

The number of atoms centered on [100] plane is 2.It is so because four atoms will be shared by four corners of the cube and there will be one central atom.Hence there will be only two atoms in one unit cell of [100] plane of silver.

Now we have to calculate the planar density PD.We know that-

                                                       PD=\frac{N}{A}

                                                               =\frac{2}{8r^2}

                                                               =\frac{2}{8*[0.144*10^{-9}]^2 }

                                                               =12.05632716*10^{18} m^{-2}  [ans]

4 0
3 years ago
You perform a double‑slit experiment in order to measure the wavelength of the new laser that you received for your birthday. Yo
Vitek1552 [10]

Answer:

λ = 5.734 x 10⁻⁷ m = 573.4 nm

Explanation:

The formula of the Young's Double Slit experiment is given as follows:

\Delta x = \frac{\lambda L}{d}\\\\\lambda = \frac{\Delta x d}{L}

where,

λ = wavelength = ?

L = distance between screen and slits = 8.61 m

d = slit spacing = 1.09 mm = 0.00109 m

Δx = distance between consecutive bright fringes = \frac{4.53\ cm}{10} = 0.00453 m

Therefore,

\lambda = \frac{(0.00453\ m)(0.00109\ m)}{8.61\ m}

<u>λ = 5.734 x 10⁻⁷ m = 573.4 nm</u>

6 0
2 years ago
During the expansion of the early universe, which two interactions were the last to separate? a. the strong and weak interaction
dimaraw [331]
The answer is:
C) The electromagnetic and weak interactions

Hope this helps.
8 0
3 years ago
For the magnetic field at some random angle to the plane of the small coil, draw a picture showing only the small coil, a vector
bearhunter [10]

Answer:

Solution attached below

Explanation:

3 0
3 years ago
A box is pushed to the right with a force of 5N and at the same time it is pushed with a force of 3.6 N to the left. If the box
Aliun [14]

Answer: a= 0.175 m/s²

Explanation: To solve for acceleration we will use Newton's Second Law of Motion which is F=ma. Since there are multiple forces acting on the object, we need to summate the forces involved. Derive to find acceleration.

a= F/m

= 5 N - 3.6 N / 8 kg

= 0.175 m/s²

8 0
3 years ago
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