Physics, 15.12.2019 12:31 maddiemalmstrom

Asample of 20.0 moles of a monatomic ideal gas (γ = 1.67) undergoes an adiabatic process. the initial pressure is 400kpa and the initial temperature is 450 k the final temperature of the gas is 320 k. what is the final volume of the gas? let the ideal-gas constant r = 8.314 j/(mol • k).

310 l
230 l
190 l
270 l
350 l

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Answer from: jay1462

Pressure and volume of an ideal gas undergoing a revisable adiabatic change of state are related as[1]:
P∙V^γ = C ( a constant )

When you substitute pressure using ideal gas law you can derive a relation for temperature and volume for such process:
P = n∙R∙T/V
=>
(n∙R∙T/V)∙V^γ = C
<=>
T∙V^(γ - 1) = C/(n∙R∙) (also a constant)

So volume and temperature in initial (1) and final (2) state are related as:
T₁∙V₁^(γ - 1) = T₂∙V₂^(γ - 1)
<=>
T₁^(1/(γ - 1))∙V₁ = T₂^(1/(^(γ - 1))∙V₂

So final volume is given by:
V₂ = V₁ ∙ (T₁/T₂∙)^(1/(γ - 1))

The temperatures are given. The initial volume can be found from ideal gas law:
V₁ = n∙R∙T₁∙/P₁
= 20mol ∙ 8.314 J∙mol⁻¹∙K⁻¹ ∙ 450K / 400×10³ Pa
= 0.187 m³
= 187 L

Hence,
V₂ = 187L ∙ (450K / 320∙)^(1/(1.67 - 1)) = 311 L ≈ 310 L

Hope this helps :)

Answer from: Quest

hi,

what occurs during a solar eclipse?

there are small tides across earth.

the moon is between earth and the sun.

p.s. im not sure if the first answer is correct because during a solar ecliphse there are spring tides and i dont know if they are the same.

Answer from: Quest

electromagnetic shielding is the practice of reducing the electromagnetic field in a space by blocking the field with barriers made of conductive or magnetic materials. shielding is typically applied to enclosures to isolate electrical devices from their surroundings, and to cables to isolate wires from the environment through which the cable runs. electromagnetic shielding that blocks radio frequency electromagnetic radiation is also known as rf shielding.

the shielding can reduce the coupling of radio waves, electromagnetic fields and electrostatic fields. a conductive enclosure used to block electrostatic fields is also known as a faraday cage. the amount of reduction depends very much upon the material used, its thickness, the size of the shielded volume and the frequency of the fields of interest and the size, shape and orientation of apertures in a shield to an incident electromagnetic

from wikipedia

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