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4 years ago

When air pressure increases the liquid in a mercury barometer?

Physics

2 answers:

MrMuchimi4 years ago

7 0

It forces the mercury to rise, being pushed up the tube by pressing down on the dish.

I hope I could help :)

maxonik [38]4 years ago

4 0

Answer:

rises

Explanation:

The pressure depends on the height of mercury column raised. It is given by the formula

P = h d g

where, h is the height of mercury, d be the density of mercury and g be the value of acceleration due to gravity.

The density of mercury is constant and the value of acceleration due to gravity is constant, so as the pressure increases the value of height also increases. Thus, the height of liquid in the mercury barometer rises.

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Two semiconductors are identical except that one has a band gap of 1.2 eV, while the other has a band gap of 1.1 eV. The room te

solong [7]

To solve this problem it is necessary to apply the relationship given by the intrinsic carrier concentration, in each of the phases.

The intrinsic carrier concentration is the number of electrons in the conduction band or the number of holes in the valence band in intrinsic material. This number of carriers depends on the band gap of the material and on the temperature of the material.

In general, this can be written mathematically as

$\eta_i = \sqrt{N_cN_v}e^{-\frac{E_g}{2KT}}$

Both are identical semiconductor but the difference is band gap which is:

$E_{g1} = 1.1eV$

$n_{i1} = 1*10^{19}m^{-3}$

$E_{g2} = 1.2eV$

$T=300K$

The ratio between the two phases are given as:

$\frac{\eta_{i1}}{\eta_{i2}} = \frac{e^{-\frac{E_{g1}}{2KT}}}{e^{-\frac{E_{g2}}{2KT}}}$

$\frac{\eta_{i1}}{\eta_{i2}} = e^{\frac{E_{g2}-E_{g1}}{2KT}}$

$\frac{\eta_{i1}}{\eta_{i2}} =e^{\frac{(1.2-1.1)(1.6*10^{-19})}{2(1.38*10^{-23})(300)}}$

$\frac{\eta_{i1}}{\eta_{i2}} =e^{-1.932367}$

$\frac{\eta_{i1}}{\eta_{i2}} =0.145$

Therefore the ratio of intrinsic carrier densities for the two materials at room temperature is 0.145

7 0

4 years ago

12.

N76 [4]

I think it is D. Brownies are harder to bake than cupcakes. an example of an objective statement is why a company is hiring for that certain job. let me know if this is correct!
Hope this helped

5 0

3 years ago

Read 2 more answers

A ball falls from the top of a building. As it falls, its speed increases. Which type of energy is the ball gaining as it falls?

Elina [12.6K]

<h2>Hello!</h2>

The answer is: B. Kinetic energy

Since the ball is falling, speed increases because the gravity acceleration is acting. When speed increases, the kinetic energy increases too, so the ball is gaining kinetic energy.

The gravity acceleration is equal to $9.81\frac{m}{s^{2}}$ , it means that when falling, the ball will increase it's speed 9.81m every second.