In nature most elements occur as a mixture of two or more isotopes. Eachisotope of an element has a fixed mass with a natural percent abundance. The mass of theelement needs to reflect the masses of these isotopes in their respective abundances. Giventhe masses and abundances, how is the Average Atomic Mass determined?
In this activity, you will determine the atomic mass of the fictitous element Candium.

This is the second of a two-semester subject sequence beginning with Atomic and Optical Physics I (8.421) that provides the foundations for contemporary research in selected areas of atomic and optical physics. Topics covered include non-classical states of light–squeezed states; multi-photon processes, Raman scattering; coherence–level crossings, quantum beats, double resonance, superradiance; trapping and cooling-light forces, laser cooling, atom optics, spectroscopy of trapped atoms and ions; atomic interactions–classical collisions, quantum scattering theory, ultracold collisions; and experimental methods.

This course uses the theory and application of atomistic computer simulations to model, understand, and predict the properties of real materials. Specific topics include: energy models from classical potentials to first-principles approaches; density functional theory and the total-energy pseudopotential method; errors and accuracy of quantitative predictions: thermodynamic ensembles, Monte Carlo sampling and molecular dynamics simulations; free energy and phase transitions; fluctuations and transport properties; and coarse-graining approaches and mesoscale models. The course employs case studies from industrial applications of advanced materials to nanotechnology. Several laboratories will give students direct experience with simulations of classical force fields, electronic-structure approaches, molecular dynamics, and Monte Carlo.

Both of these lessons are classroom activities that require students to build models that display understanding of atoms and molecules. One lesson is structured while the other is guided.

In this lesson, the students will discover the relationship between an object's mass and the amount of space it takes up (its volume). The students will also learn about the concepts of displacement and density.

This collection uses primary sources to compare American responses to Pearl Harbor and September 11. Digital Public Library of America Primary Source Sets are designed to help students develop their critical thinking skills and draw diverse material from libraries, archives, and museums across the United States. Each set includes an overview, ten to fifteen primary sources, links to related resources, and a teaching guide. These sets were created and reviewed by the teachers on the DPLA's Education Advisory Committee.

This video demonstrates an effective attention getting signal as well as tips for teaching this signal to your class.

This video demonstrates an effective attention getting signal as well as tips for teaching this signal to your class.

This video demonstrates how to help students learn to expect direction from one spot in the classroom. Teachers will consider why it is effective to have students' full attention before teaching or giving directions; how teacher consistency improves student response; and what additional cues or signals may be used to capture students' attention?

Novel representations and diverse perspectives can reveal new insights into complex systems, and can support rich understandings of the world. In this activity, students will identify and analyze the choices artists and scientists make when creating representations of living or non-living natural objects. This process will help students recognize the potential and place for their own articulation of how the world works. After drawing from nature, students will reflect on the process of representing information, then compare their drawings with that of a 16th-century artist. Students will consider what is included and what is excluded, and hypothesize about larger contexts and systems.

This video shows where and how ice cores are extracted from the West Antarctic Ice Sheet. The cores are cut, packaged, flown to the ice core storage facility in Denver, further sliced into samples, and shipped to labs all over the world where scientists use them to study indicators of climate change from the past.

In this simulation of a doctor's office, students play the roles of physician, nurse, patients, and time-keeper, with the objective to improve the patient waiting time. They collect and graph data as part of their analysis. This serves as a hands-on example of using engineering principles and engineering design approaches (such as models and simulations) to research, analyze, test and improve processes.

We use motion detectors and a bowling ball to find relationships velocity, mass, and energy.

Consider the opposing views on the policy implemented at the University of Brasilia in this Wide Angle video.

The climate of repression established in the name of wartime security during World War I continued after the war as the U.S. government focused on communists, Bolsheviks, and "reds." This anticommunist crusade climaxed during the "Palmer raids" of 1919-1921, when Attorney General A. Mitchell Palmer's men, striking without warning and without warrants, smashed union offices and the headquarters of Communist and Socialist organizations. Palmer believed that communism was "eating its way into the homes of the American workman." Palmer charged in this 1920 essay that communism was an imminent threat and explained why Bolsheviks had to be deported.

This Freshman Advising Seminar surveys the many applications of magnets and magnetism. To the Chinese and Greeks of ancient times, the attractive and repulsive forces between magnets must have seemed magical indeed. Through the ages, miraculous curative powers have been attributed to magnets, and magnets have been used by illusionists to produce "magical" effects. Magnets guided ships in the Age of Exploration and generated the electrical industry in the 19th century. Today they store information and entertainment on disks and tapes, and produce sound in speakers, images on TV screens, rotation in motors, and levitation in high-speed trains. Students visit various MIT projects related to magnets (including superconducting electromagnets) and read about and discuss the history, legends, pseudoscience, science, and technology of types of magnets, including applications in medicine. Several short written reports and at least one oral presentation will be required of each participant.

Students explore area as an attribute of two-dimensional figures and relate it to their prior understandings of multiplication. Students conceptualize area as the amount of two-dimensional surface that is contained within a plane figure.

In this lesson, students analyze a daring challenge to the legal and social order of the time: Susan B. Anthony’s casting of an illegal ballot in the 1872 presidential election. Anthony was ultimately put on trial, convicted, and fined $100 for her “crime.” In this lesson, students close read an excerpt from Anthony’s speech Is It a Crime for Women to Vote? in which Anthony defended her actions. The speech, written prior to Anthony’s trial in 1873, contains many themes that resonate with contemporary debates about membership in American society. At a time when voter suppression, gerrymandering, and election interference dominate the headlines, this lesson prompts students to draw connections between the past and present, especially around acts of civil disobedience, the role of voting in a democracy, and the meaning of equality.

What drives changes to classic myths and fables? In this lesson students evaluate the changes Disney made to the myth of "Hercules" in order to achieve their audience and purpose.