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dmitriy555 [2]
2 years ago
8

Metallic gold crystallizes in a face-centered cubic lattice, with one au atom per lattice point. if the edge length of the unit

cell is found to be 408 pm, what is the metallic radius of au in pm?
Physics
1 answer:
vaieri [72.5K]2 years ago
6 0

The metallic radius (r) of au is 144.2pm

A face-centered cubic unit cell structure is made up of atoms arranged in a cube with six additional whole atoms placed in the centre of each cube face and a fraction of an atom at each of the cube's four corners. Eight additional unit cells share the atoms at the cube's corner.

Atoms in an FCC crystal are in contact along the unit cell's diagonal.          4r = √2 a, where r is the radius of an atom and a is the edge length of a unit cell.

Putting the values in the above expression,we get

r = √2×408 / 4

r = \frac{1.414*408}{4}

r = \frac{576.9}{4}

r = 144.2 pm

Therefore, The metallic radius (r) of au is 144.2pm

Learn more about metallic radius (r) here;

brainly.com/question/14885097

#SPJ4

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You are driving your car along a country road at a speed of 27.0 m/s. as you come over the crest of a hill, you notice a farm tr
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speed of truck ahead = 10 m/s

relative speed of car with respect to truck

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now the distance before they stop with respect to each other is given by

v_f^2 - v_i^2 = 2 a d

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Part b)

Distance traveled by car before it stops is given by

v_f^2 - v_i^2 = 2 a s

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s = 52.1 m

so it will stop after it will cover total 52.1 m distance

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v_f - v_i = at

0 - 27 = (-7) * t

t = 3.86 s

now the distance covered by truck in same time

d = 3.86 * 10 = 38.6 m

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3 years ago
You have a double slit experiment, with the distance between the two slits to be 0.025 cm. A screern is 120 cm behind the double
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The wavelength of the light is 633 nm.

Explanation:

Given that,

Distance between the two slits d= 0.025 cm

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Distance between the slits y= 1.52 cm

We need to calculate the angle

Using formula of double slit

\tan\theta=\dfrac{y}{D}

Where, y = Distance between the slits

D = Distance between the screen and slits

Put the value into the formula

\tan\theta=\dfrac{1.52}{120}

\theta=\tan^{-1}\dfrac{1.52}{120}

\theta=0.725

We need to calculate the wavelength

Using formula of wavelength

d\sin\theta=n\lambda

Put the value into the formula

0.025\times\sin0.725=5\times\lambda

\lambda=\dfrac{0.025\times10^{-2}\times\sin0.725}{5}

\lambda=6.326\times10^{-7}\ m

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Hence, The wavelength of the light is 633 nm.

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