2 years ago

When the temperature of matter decrease , the particles do what

Physics

1 answer:

Rom4ik [11]2 years ago

4 0

Answer:

When the temperature decreases the particals start to slow down.

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Consider a sealed 20 cm high electronic box whose base dimensions are 40cm x 40cm placed in a vacuum chamber. The emissivity of

Genrish500 [490]

Answer:

$T_{surr}=296.289\ K$

In Celsius:

$T_{surr}=296.289-273\\T_{surr}=23.289^oC$

Explanation:

The formula we are going to use is:

$\dot Q_{rad}=\epsilon\sigma A_s(T_s^4-T_{surr}^4)$

Where:

ε is the emissivity

σ is the Stefan constant

$T_s$ is the final temperature of surrounding surfaces

$T_{surr}$ is the required temperature

$A_s$ is the are of surrounding surface

Calculating The area:

$A_s=(0.4)(0.4)+4(0.4)(0.2)\\A_s=0.48\ m^2$

σ= $5.67*10^{-8}\ W/m^2.K^4$

ε =0.95

$T_s$ =55+273

$T_s$ =328 K

$\dot Q_{rad$ =100 W

$100=0.95(5.67*10^{-8})(0.48)(328^4-T_{surr}^4)\\3867693926=(328^4-T_{surr}^4)\\T_{surr}^4=7706623130\\T_{surr}=296.289\ K$

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$T_{surr}=296.289-273\\T_{surr}=23.289^oC$

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