1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
muminat
3 years ago
9

Consider Al at room temperature. Its electron density is n = 18 x 1022 cm-3 and its electrical resistivity is rho = 2.45 μΩ-cm.

Find its electron relaxation time τ and electron mean free path in the Drude model.
Chemistry
1 answer:
Marianna [84]3 years ago
8 0

Answer:

\tau=1.28968\times 10^{-8}\ s is the electron relaxation time

l=9.6726\times 10^{-4}\ m is the mean free path

Explanation:

Given:

  • electron density of aluminium at room temperature, n=18\times 10^{22}\ cm^{-3}
  • resistivity of aluminium, \rho=2.45\times 10^{-8}\ \Omega.m

<u>From the Drude's model we have:</u>

\tau=\frac{m}{\rho.n.q^2}

where:

\tau= electron relaxation time

m= mass of a charge

q= magnitude of a charge

Putting respective values for electron:

\tau=\frac{9.1\times 10^{-31}}{2.45\times 10^{-8}\times 18\times 10^{22}\times (1.6\times 10^{-19})^2}

\tau=8.0605\times 10^{-9}\ s

<u>Mean free path is given as:</u>

l=v_a.\tau

where:

l= mean free path

v_a= average velocity of electrons

  • Now we have the the general value of average velocity of electrons at room temperature:

v_a=120000\ m.s^{-1}

So,

l=120000\times 8.0605\times 10^{-9}

l=9.6726\times 10^{-4}\ m

You might be interested in
Explain how condensation is invovled in the water cycle
blagie [28]

Condensation is the process of watervapor in the air is changing into liquid water. Condensation is crucial to the water cycle because it is responsible for the formation of clouds. Condensation is also the opposite of evaporation
8 0
3 years ago
Does the reaction of a burning candle give off or absorb heat
NemiM [27]
<span>The reaction of a burning candle gives off heat and is an exothermic reaction. It does not absorb heat because it does not cool down its surroundings as the candle burns. The answer is the reaction of a burning candles gives off heat.</span>
6 0
3 years ago
What are the 20 elements of periodic table​
sergij07 [2.7K]

Answer:

H - Hydrogen

He - Helium

Li - Lithium

Be - Beryllium

B - Boron

C - Carbon

N - Nitrogen

O - Oxygen

F - Fluorine

Ne - Neon

Na - Sodium

Mg - Magnesium

Al - Aluminum

Si - Silicon

P - Phosphorus

S - Sulfur

Cl - Chlorine

Ar - Argon

K - Potassium

Ca - Calcium

3 0
3 years ago
How many grams are in 3.67 moles of lithium cyanide
OLga [1]

Answer: 120.9 grams

Explanation:

Given the question : How many grams are in 3.67 moles of Lithium cyanide?

Chemical formula of lithium cyanide = LiCN

Molar mass of LiCN: Li = 6.941 ; C = 12, N = 14

LiCN = (6.941 + 12 + 14). = 32.941 g/mol

(Gram of substance / mole of substance) = (molar mass of substance / one mole)

(Gram of substance / 3.67) = (32.941 / 1)

= gram * 1 = 3.67 * 32.941

Gram of substance = 120.89347

= 120.9 grams

5 0
4 years ago
What is the molarity of a solution which contains 0.88 g of barium chloride in 120.0 mL of solution
Andre45 [30]

Answer:00.73

Explanation:

Divide 0.88g by 120.0ml

6 0
4 years ago
Other questions:
  • Directions: Using the formula on the right, Move the correct elements into the equation below:
    5·1 answer
  • Find the molality of the solution if 42 grams of lithium chloride (LiCl) are dissolved in 3.6 kg of water.
    10·1 answer
  • When an electron is displaced in a semiconductor, the hole that's left behind is
    6·2 answers
  • Which electrons do a lewis structure show?
    8·1 answer
  • Explain why neptune cannot be seen without a telescope
    12·1 answer
  • D.
    5·2 answers
  • Rust is soft and ---------
    14·1 answer
  • Whoever gets right I will give you Brainly
    14·2 answers
  • 8.) If 396 g of Carbon Dioxide (CO2) are produced, what mass of Oxygen
    12·1 answer
  • What is the first step of the scientific process?
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!