1. Firstly, there is the earth's Magnetic field. So there has to be coils that make a field in the opposite direction. After that it operates another field that effects the electrons in our body. That lets us find out how the inside looks. If you are still curious, reasearch and write your opinions below.

2. There will probably be many rapid back-and-forth marks if it's a high sound. In loud sounds, the amplitude increases, and so each stroke would be longer.

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> Q1. In page 58, the book says we can use ultrasound to produce imags inside the body.
> In an MRI we use Magnetic waves to look inside the body. Explain how this thing would work.
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> Q2. Look at page 63 and state how the recorded grooves differ at different pitches or loudness of sound
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> Q3. Do the experiment discribed in 73p. State what you thought after the experiment.
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> To be answered by 2/17 after reading chap2.4 and 3.1(58~78p).