Chemistry, 19.02.2020 02:43 moneytt2403

Compute the electrical conductivity of cylindrical silicon specimen 5.1 mm (0.2 in.) in diameter and 51 mm (2 in.) in length in which a current of 0.1 A passes in an axial direction. A voltage of 12.5 V is measured across two probes that are separated by 38 mm (1.5 in.).

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Answer from: Animallover100

Therefore electric conductivity $\sigma$ =1.46 (Ω-m)⁻¹

Explanation:

$\sigma=\frac{1}{\rho} =\frac{Il}{VA}$

Here σ= electrical conductivity

= current = 0.1 A

= length= 38 mm= 38×10⁻³ m

v= voltage = 12.5 V

A = area = $\pi(\frac{d}{2} )^{2}$ = $\pi (\frac{51\times 10^{-3}}{2} )^2$ m²

$\sigma=\frac{(0.1)\times 38\times 10^{-3}}{12.5\times \pi (\frac{51\times 10^{-3}}{2} )^2 }$

=1.46 (Ω-m)⁻¹

Therefore electric conductivity $\sigma$ =1.46 (Ω-m)⁻¹

Answer from: Quest

a mercury barometer is a device that uses the physical properties of mercury in a tube to measure barometric pressure. mercury barometers are used for : -

1. measurement of atmospheric pressure

2. determining the altitude of a place

3. weather forecasting

4. calibration and checking of aneroid barometers

5. application in fluid mechanics

6. measurement of pressure in aircrafts

7. surface weather analysis

8. preparation of barographs

9. usage in physical sciences like physics, astronomy & chemistry

10. preparation of aircraft altimeters

characteristics of mercury barometer : -

1.used to define and measure atmospheric pressure.

2.on the average at sea level the column of mercury rises to a height of about 760 mm.

3.this quantity is equal to 1 atmosphere.

4.it is also known as standard atmospheric pressure.

5.a barometer in which the weight of a column of mercury in a glass tube with a sealed top is balanced against that of the atmosphere pressing on an exposed cistern of mercury at the base of the mercury column, the height of the column varying with atmospheric pressure.

Write 15 uses of a mercury barometer along with its characterestics

Answer from: Quest

metals are good conductor of electricity. it has free electrons on their surface. according to electron pool theory, each atom present in a metal crystal losses all of its valence electron and as a result a pool of free is form. these pool of electrons are free to move and conduct electricity easily while making metal as good conductor.

the correct answer is a. the ability of electrons to flow throughout the metal.

if it's not useful, feel free to report for mistake in answer.

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Compute the electrical conductivity of cylindrical silicon specimen 5.1 mm (0.2 in.) in diameter and...