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3 years ago

Which property is better explained by the band theory than by the sea of electrons model?

2 answers:

7 0

Luster is the way light connects with the surface of a valuable stone, shake, or mineral. The word takes after its beginnings back to the Latin lux, meaning "light", and all things considered gathers brightness, glimmer, or quality. The terms are once in awhile solidified to delineate direct sorts of luster.

Alex_Xolod [135]3 years ago

6 0

Which property is better explained by the band theory than by the sea of electrons model?
ductility
thermal conductivity
luster
electrical conductivity

its C luster

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A 75 um thick polysulphone microporous membrane has an average porosity of E 0.35. Pure water flux through the membrane is 35 m'

Paul [167]

Explanation:

The given data is as follows.

Water flux, $J_{w}$ = 25 $m^{3}/m^{2}h$

= $\frac{25}{3600} m^{3}/m^{2}h$

So, let velocity (u) = $\frac{25}{3600}$ m/s = $6.9 \times 10^{-3}$

$\rho$ = 998 $kg/m^{3}$

Pore size, d = $0.8 \times 10^{-6} m$

$\mu$ = 0.9 cP = $9 \times 10^{-4}$ Pa.s

Hence, calculate the reynold number as follows.

$R_{e} = \frac{\rho \times u \times d}{\mu}$

= $\frac{998 kg/m^{3} \times 6.9 \times 10^{-3} \times 0.8 \times 10^{-6} m}{9 \times 10^{-4} Pa.s}$

= $612.1 \times 10^{-5}$

= 0.006

This means that the flow is laminar.

Now, we use Hagen-Poiseuille equation as follows.

$J_{w} = \frac{\varepsilon \times d^{2}}{32 \times \mu \times \tau} \times \frac{\Delta P}{L_{m}}$

where, $\varepsilon$ = membrane porosity = 0.35

d = $0.8 \times 10^{-6}$ m

$\Delta P$ = $2 \times 10^{5} Pa$

$\mu$ = $9 \times 10^{-4}$

$\tau$ = tortuosity

$L_{m}$ = membrane thickness = $75 \times 10^{-6} m$

$\frac{25}{3600} = \frac{0.35 \times (0.8 \times 10^{-6})}{32 \times (9 \times 10^{-4}) \times \tau}$

$\tau$ = 3.73

Hence, the tortuosity factor of the pores is 3.73.

As flow resistance = $R_{m}$

$J_{w} = \frac{\Delta P}{r \times R_{m}}$

$R_{m} = 3.2 \times 10^{10} m^{-1}$

Water permeability is represented by $L_{p}$ .

$J_{w} = L_{p} \times \Delta P$

$6.9 \times 10^{-3}$ = $L_{p} \times 2 \times 10^{5} Pa$

$L_{p} = 3.45 \times 10^{-8} m^{3}/m^{2}s Pa$

Therefore, the resistance to flow is $3.2 \times 10^{10} m^{-1}$ and its water permeability is $3.45 \times 10^{-8} m^{3}/m^{2}s Pa$ .

3 0

3 years ago

Which of the following is an example of a compound? CaCl2 Na Nd Cu

madam [21]

CaCl2

All of the other choices are elements

5 0

3 years ago

Write a balanced chemical equation for dissolving calcium chloride in water.

jarptica [38.1K]

CaCl2(s) -> Ca^2+(aq)+Cl(aq)

3 0

4 years ago

Brainly.com

Inga [223]

The correct answer is 1.6 × 10¹⁰ .

The volume of ice chunk can be calculated by using the formula length × breadth × height

The length of the ice chunk given is 98 m, the breadth of the ice chunk given is 25 m and the thickness of the ice chunk given is 750 m,

= 98 × 25 × 750 × 0.000189

= 347.9 m³

= 3.831 × 10¹⁴ gal

Water in swimming pool is 24000 gal

Therefore, number of pools that can be filled = 3.831 × 10¹⁴ / 24000

= 1.596 × 10¹⁰

= 1.6 × 10¹⁰

3 0

4 years ago

Earth's atmosphere blocks short wavelengths of the electromagnetic spectrum. Which telescopes must be places in orbit around Ear

Ostrovityanka [42]

Answer: gamma-ray telescopes

Explanation:

this is the answer because the question is asking what telescope must be

placed to observe SHORT-WAVELENGTH radiation. Gamma-rays have very short wave-lengths so therefore it would be gamma-ray telescopes. visible, infrared, and radio all have long wave-lengths, so we can instantly eliminate them.

8 0

3 years ago