5. If you zoom in on an apple until its atoms are as big as the original apple,

Question

5. If you zoom in on an apple until its atoms are as big as the original apple, approximately how big will the original apple have been magnified too? Verify your answer with mathematical estimates based on your intuition.

6. What is the pressure in an infinite volume system with no walls? Explain your answer like Feynman does in terms of “jiggling and vibrating atoms”.

7. If you decrease temperature down to absolute zero, do atoms stop “jiggling and vibrating”? Why or why not? (Hint: this is discussed in both Ch 1 and Ch 2)

8. Why does a liquid cool in a cup when it evaporates? Explain your answer like Feynman does in terms of “jiggling and vibrating atoms”.

Explanation / Answer

5.

About 10^8 times. that's 100 million times.

Because , An apple's size if of the order 10^-1 m and atom's size is of the order 10^-9m

On division we get 10^8

6)

Zero.
Because pressure is a result of molecules hitting the walls of the container. If container is infinite, the molecules will never be able to reach the walls and hence create no pressure.

7)

Yes, they stop.

Because all the internal energy is a direct result of the temperature. And also vice versa.

So, absolute zero temp means zero internal energy and zero vibrations

8)

On evaporation, it absorbs heat from the cup.
In terms of vibrations: The vibrations of the cup get transferred to liquid molecules. On high vibrations, liquid becomes gas and evaporation is what we see. As cup's vibrations have reduced, it becomes cooler.

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