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# GDB of phy101 last date 29-06-2012

plz share ur GDB solution for Idea plzzzzzzzzz

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### Replies to This Discussion

idea for the solution of gdb of phy101

The Sun becomes more entropic while the Earth's biosphere becomes less entropic.The reason the Earth can become less entropic, which you may have heard is impossible, is because the Earth is NOT a closed system. It has an input, the Sun.
However, the decrease in Earth's entropy is less than the increase in the Sun's entropy, so overall entropy increases as it always must.

Anybody  more share solution gdb plz??????????????????//

Sumaira shabbir gud keep it up

"Is there entropy changes associated with the transmission of energy from the sun to the
earth? Are the earth and sun in thermal equilibrium?
Does radiation differ from other modes of heat transfer with respect to the entropy
Solution: 1
In the given condition the Sun becomes more entropic while the Earth's biosphere
becomes less entropic. Here the main reason is Earth can become less entropic, which
you may have heard is impossible, is because the Earth is NOT a closed system. It has an
input, the Sun. However, on the other hand the decrease in Earth's entropy is less than the
increase in the Sun's entropy, so overall entropy increases as it always must. So this is
further explanation of my reason
Solution: 2
Is there entropy changes associated with the transmission of energy from the sun to the
earth?
YES Entropy = S = integral dQ/T
As Earth has a lower temp, the entropy increase from insolation is lower than the entropy
decrease of the Sun, demonstrating a net increase in entropy.
Another similar note: look at DeltaS on Earth, as sunlight comes and reradiation at night
cools the Earth, and see that that reradiation gives a higher entropy than insolation, so
there is room for us on Earth to create entropy.

"Is there entropy changes associated with the transmission of energy from the sun to the
earth? Are the earth and sun in thermal equilibrium?
Does radiation differ from other modes of heat transfer with respect to the entropy

Solution: 1
In the given condition the Sun becomes more entropic while the Earth's biosphere
becomes less entropic. Here the main reason is Earth can become less entropic, which
you may have heard is impossible, is because the Earth is NOT a closed system. It has an
input, the Sun. However, on the other hand the decrease in Earth's entropy is less than the
increase in the Sun's entropy, so overall entropy increases as it always must. So this is
further explanation of my reason

Solution: 2
Is there entropy changes associated with the transmission of energy from the sun to the
earth?
YES Entropy = S = integral dQ/T
As Earth has a lower temp, the entropy increase from insolation is lower than the entropy
decrease of the Sun, demonstrating a net increase in entropy.
Another similar note: look at DeltaS on Earth, as sunlight comes and reradiation at night
cools the Earth, and see that that reradiation gives a higher entropy than insolation, so
there is room for us on Earth to create entropy.

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