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Radda [10]
3 years ago
7

In class you learnt that the energy and kT relationship. i) Please calculate the fermi energy function for E-Ef=kT. ii) Please c

alculate the temperature is occupied by an electron with E-Ef = 0.3eV energy at 4% probability state?
Engineering
1 answer:
weeeeeb [17]3 years ago
7 0

Answer:

Fermi energy is the highest energy occupied by an electron at absolute zero degree Kelvin (0K).

Explanation:

i) Fermi energy  function, E - Ef = h²/2mo{3π²N/V} (where, N = number of particle; h = Planck constant; V = Volume of the system; mo = mass of each electron)

ii) Let 4% probability state = Kβ = 0.04

∴ To calculate Fermi temperature = Ef/Kβ = 0.3eV/0.04 =7.5°C

But in degree Kelvin = (273 + 7.5)K = 280.5K

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Olegator [25]

Answer:

119.35 mm

Explanation:

Given:

Inside diameter, d = 100 mm

Tensile load, P = 400 kN

Stress = 120 MPa

let the outside diameter be 'D'

Now,

Stress is given as:

stress = Load × Area

also,

Area of hollow pipe = \frac{\pi}{4}(D^2-d^2)

or

Area of hollow pipe = \frac{\pi}{4}(D^2-100^2)

thus,

400 × 10³ N = 120 × \frac{\pi}{4}(D^2-100^2)

or

D² = tex]\frac{400\times10^3+30\pi\times10^4}{30\pi}[/tex]

or

D = 119.35 mm

7 0
3 years ago
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HELP PLEASE!! ASAP!!!!
dezoksy [38]

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Edit: Use these to write your paragraph.

5 0
3 years ago
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Suppose there are 93 packets entering a queue at the same time. Each packet is of size 4 MiB. The link transmission rate is 1.4
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Answer:

0.19s

Explanation:

Queueing delay is the time a job waits in a queue before it can be executed. it is the difference in time betwen when the packet data reaches it destination and the time when it was executed.

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where N = no of packet =93

L = size of packet = 4MB

R = bandwidth = 1.4Gbps = 1×10⁹ bps

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5 0
3 years ago
Technician A says that a lack of lubrication on the back of the disc brake pads can cause brake noise. Technician B says that pa
sweet-ann [11.9K]

Answer:

Technician A and B both are correct.

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According to Technician A, we can stop noise by set-up right position for break pad.

7 0
3 years ago
A fluid flows along the x axis with a velocity given by V = (xt) i ˆ, where x is in feet and t in seconds. (a) Plot the speed fo
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Answer

See explanation for step by step procedures towards getting answers

Explanation:

Given that;

A fluid flows along the x axis with a velocity given by V = (xt) i ˆ, where x is in feet and t in seconds. (a) Plot the speed for 0 ≤ x ≤ 10 ft and t = 3 s. (b) Plot the speed for x = 7 ft and 2 ≤ t ≤ 4 s. (c) Determine the local and convective acceleration. (d) Show that the acceleration of any fluid particle in the flow is zero. (e) Explain physically how the velocity of a particle in this unsteady flow remains constant throughout its motion.

See attachments for further explanations

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3 years ago
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