Why is a thermos considered a (mostly) closed system? Question 3 options: different types of liquids stay hot thermoses come in
1 answer:
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Solution :
From Fick's law:
Mass balance: Exits = Accumulation
From the last step, area cancels out and thus leaves :
So now we can substitute the by the Fick's law
Substituting the values we get
Explanation:
It is known that relation between heat energy and temperature change is as follows.
Q =
where, q = heat energy
m = mass of the solution or solvent
= change in temperature
Hence, putting the given values into the above formula as follows.
Q =
=
= 34650 J
Now, calculate the energy of photons at wavelength 3.02 mm as follows.
E =
where, h = planks constant =
c = velocity of light = m/s
= wavelength = 3.02 mm =
m (as 1 m = 1000 mm)
Therefore, putting the given values into the above formula as follows.
E =
=
= J
Now, the number of photons required of energy J/photon for the total energy of 34650 J as follows.
n =
=
= photons
or, = photons
Thus, we can conclude that the minimum number of photons present are .