MIT 8.02 Electricity and Magnetism Lecture 35

Doppler Effect. The Big Bang. Cosmology.

 

How Much Does a Shadow Weigh?

Light pressure, Cherenkov radiation, photonic boom and more!

Other Vsauce videos

Redshift - Sixty Symbols

You've heard of redshift, but what about the "blue shifting galaxy" on a collision course with the Milky Way!?

Other Sixty Symbols videos

MIT 8.01 Classical Mechanics Lecture 29

MIT Physics Course

Professor Walter Lewin

8.01 Physics  I: Classical Mechanics, Fall 1999

Examen review:  collisions, rotation, Kepler's laws, Doppler shift, rolling objects.

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Expansion of the Universe and Red Shift of Cosmic Background

As the universe expands (represented by the expanding balloon) the cosmic background (represented by the wavy line) gets stretched out to longer and longer wavelengths (distance between peaks on the wavy line).

Other animations by Penn State Schuylkill

MIT 8.01 Classical Mechanics Lecture 23

MIT Physics Course

Professor Walter Lewin

8.01 Physics  I: Classical Mechanics, Fall 1999

Doppler effect, binary stars, x-ray binaries,  neutron Stars and black holes

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Electric Generator

This is an alternating current generator: a conducting coil (shown in yellow) rotates inside a magnetic field (the field lines are green here). The vector "A" is perpendicular to the area of the coil (its magnitude is the area of the coil). During rotation of the coil, the magnetic flux changes and an alternating current is induced in the coil. The first graph show the magnetic flux, the other graph shows current intensity.

Other animations by Yves Pelletier

Doppler effect

Four short animations illustrating Doppler effect:

1) Listener in motion

First, the listener is at rest, then he moves toward the source; finally, he moves away from the source.



2) Source in motion

The source (in red) move away from green listener and toward cyan listener.



3) Source in motion at the speed of sound, formation of a shock wave (sound barrier)



4) Source in motion at twice the speed of sound (Mach cone)



Other animations by Yves Pelletier

Yale: Frontiers and Controversies in Astrophysics, Lecture 5

ASTR 160 - Frontiers and Controversies in Astrophysics

Professor Charles Bailyn

Spring 2007

Source: Yale University, Open Yale Courses

First 10 minutes: some comments about assignment "Is the controversy about Pluto a scientific controversy?"; science can be affected by culture.  Motion of star and planet around the center of mass.  Graph of radial velocities interpreted as a system containing 3 planets.  Back to "hot jupiters":  discovery of 51 Peg b shows the importance of "expecting the unexpected". Alternative explanations of hot jupiters (double star systems, pulsating stars) proved wrong.

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Mach Cone

Cone-shaped shock wave generated by a supersonic plane.

Yale: Frontiers and Controversies in Astrophysics, Lecture 4

ASTR 160 - Frontiers and Controversies in Astrophysics

Professor Charles Bailyn

Spring 2007

Source: Yale University, Open Yale Courses

Professor Bailyn talks about formation of planets and why the inner planets (like earth) are different from the outer planets (like jupiter).  He calculates the velocity of the sun caused by Jupiter (which is detectable) and the velocity of the sun caused by the earth (which is too small to be detectable).  How we use Doppler shift to measure the velocity of distant stars.  Data showing an exoplanet orbiting at a short distance from its star, but showing the characteristics of an outer planet:  a "hot Jupiter".

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