52_100_Lecture_9_13_07

52_100_Lecture_9_13_07 - 9/12/2007 Energy, Mass, and Albert...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon
9/12/2007 1 Energy, Mass, and Albert Einstein Law of Conservation of Mass: mass can neither be created or destroyed as a result of chemical transformations Law of Conservation of Energy: energy can neither be created or destroyed as a result of chemical transformations Subatomic reactivity altered our perception of these laws We observed the conversion of matter into energy and the formation of matter from energy 1 Einstein’s most famous equation: E = mc 2 E = energy, m = mass, c = speed of light in a vacuum (3.0 x 10 8 m/s) Nuclear Fusion Nuclear Fusion: process in which several nuclei of small mass combine to form a single nucleus of larger mass Need extremely high temperatures – 10 million to 100 million o C The combination of four hydrogen atoms to create a helium atom is the fusion reaction of the sun 1 1 H 4 4 2 He + 4 γ 2 The hydrogen bomb is a fusion bomb It takes a fission bomb to produce the temperatures needed to detonate a fusion bomb
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
9/12/2007 2 Nuclear Power: Not Just for War Nuclear Energy Nuclear Medicine Nuclear Calendar 3 How Does a Nuclear Reactor Work? Slightly enriched uranium is formed into pellets the diameter of a dime and about an inch thick The pellets are arranged into long rods and the rods are bundled The pellets are arranged into long rods and the rods are bundled together A fission chain reaction generates heat which converts water to steam and the steam turns a turbine attached to an electric generator Control rods (typically boron or cadmium) are used to regulate the 4 neutron flow to avoid overheating The steam is condensed to liquid in the cooling tower and recycled
Background image of page 2
9/12/2007 3 How Does a Nuclear Reactor Work? Boiling-Water Reactor, BWR: the bundles are submerged in water and steam carries the heat Pressurized-Water Reactor, PWR: pressurized water carries the heat The steam that turns the turbine is in a separate container from the water or steam from the reactor 5 How Does a Nuclear Reactor Work? 6
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
9/12/2007 4 Outside the Nuclear Power Plant The reactor is housed inside concrete liner that acts as a radiation shield The liner is inside a larger steel containment vessel that also The liner is inside a larger steel containment vessel that also contains the hardware to maintain the reactor The containment vessel is housed inside a concrete building that can withstand a jetliner crash. This is the secondary containment to make sure no radioactive
Background image of page 4
Image of page 5
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 10

52_100_Lecture_9_13_07 - 9/12/2007 Energy, Mass, and Albert...

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online