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# The nuclear masses of 7Be, 9Be, and 10Be are 7.0147,

ISBN: 9780321696724 27

## Solution for problem 79AE Chapter 21

Chemistry: The Central Science | 12th Edition

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Problem 79AE

Problem 79AE

The nuclear masses of 7Be, 9Be, and 10Be are 7.0147, 9.0100, and 10.0113 amu, respectively. Which of these nuclei has the largest binding energy per nucleon?

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Note taker: Sera ASTR 1345 Light and Energy Observational Astronomers  Use telescopes to study actual events and phenomena  Ex. Edwin Hubble, Galileo Galilei Theoretical Astronomers  Use mathematics and physics-based predictions and theories  Ex. Stephen Hawking, Kip Thorne Computational Astronomers  Recreate and test complex physical situations with computers  Ex. Roadrunner Computer (1,700,000,000,000,000 calculations per second) Where Light Comes From  Emitted: an object gives off energy o Depends strongly on temperature  Reflected o Emitted light from one object bounces off of another  Scattered o Chemicals reflect light unevenly White Light  Newton’s Prism o White light (like sunlight) is a combination of all visible colors o A medium of different density will cause light to reflect (bend) Refraction  When light is passed through a medium, the path of it gets deviated  Light only travels in a straight line at the speed of light “The Light Bucket” - The Telescope  A simple refracting telescope o Uses lenses to refract light o Most important astronomical invention  Human vision is unreliable o Light enters the small pupil and is focused light detecting cells

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The nuclear masses of 7Be, 9Be, and 10Be are 7.0147,