2.19
The Count of Monte Cristo, by Alexandre Dumas:
Chapter 1: When the Pharaon arrives at Marseilles we meet Edmond Dantes, the first mate, and Monsieur Morrel. After paying his first respects to Morrel, Edmond tells him how Captain LeClere died of brain-fever on the voyage. Danglars, the purser, tells Morrel of how Edmond stopped at the Isle of Elba for no apparent reason. Edmond justifies himself, saying how the captain’s dying wish had been for him to deliver a packet to the Marechal there. Morrel asks him if he saw the emperor (Napoleon), Edmond replies yes. Morrel invites Edmond to dinner, but he excuses himself saying he must first see his father and his betrothed. Morrel accepts this and hints that Edmond may become the next captain of the Pharaon. Edmond takes his leave.
Filed under: My lessons | Tags: CAT, Elements, Laser Surgery, MRI, PET, Physics
2.2
Physics In Your Life: Nuclear Matters
Things I learned:
- Water made with Oxygen-16 and water made with Oxygen-18 evaporate at different rates because their mass is different.
- Process of Fission – Uranium-235 hit by neutron, U-235 becomes U-236, U-236 vibrates, structure becomes elongated, eventually splits, sends neutrons everywhere, neutrons collide with more U-235, creates a chain reaction.
- Only U-235 readily fissions.
- U-235 only makes up about 0.7% of all natural Uranium.
- A half life is the time until half the nuclei decay.
|
Nucleus |
Halflife |
|---|---|
| Uranium-238 | 4.5 Billion years |
| Uranium-235 | 700 Million years |
| Strontium-90 | 29 years |
| Plutonium-239 | 24 Thousand years |
| Carbon-14 | 5,730 years |
| Oxygen-15 | 2 minutes |
| Radon-222 | 91.2 hours |
2.3
Physics In Your Life: Physics in your body
Things I learned:
- CAT = Computerized Axial Tomography.
- MRI= Magnetic Resonance Imaging.
- PET = Positron Emission Tomography.
- Laser eye surgery basically weld retina back onto the back of the eye.
- Laser surgery causes less bleeding versus a regular scalpel because the protein in the tissue instantly coagulates.
- Steady electric current and ultrasound can help heal broken bones.
