Nuclear and Elementary Particle Physics

Rutherford Scattering

[L | t+ | ★★★]
Air table with fixed magnetic puck to represent nucleus scatters "projectile" magnetic pucks.

[In-Depth Description]

Rutherford Scattering Model with Van de Graaff

[M | t+ | —]
Charged Christmas tree balls scatter off of Van de Graaff.

Rutherford Scattering Model with Ping Pong Balls

[L | t+ | —]
Ping Pong ball projectiles scatter off of a sphere and into buckets set at different distances (scattering angles).

Potential Well Orbiter

[M | t | ★]
Orbital motion simulated by ball rolling on wooden potential well.

[In-Depth Description]

Roller Coaster Potential

[M | t | —]
One-dimensional model of electron trapped in atomic potential well.

[In-Depth Description]

Giant Nuclear Potential Well

[M | t | —]
Use a hammer to enable a ball to overcome potential barrier.

CRT Paddle Wheel

[S | t+ | —]
A beam of cathode rays (electrons) impinging on a paddle wheel cause it to spin and travel down the vacuum tube.

[In-Depth Description]

Determination of e/m

[L | t++ | —]
Charge to mass ratio of electron, using electron beam in magnetic field of Helmholtz coils.

JJ Thomson e/m Tube

[S | t++ | —]
Similar to preceding demo but the geometry is similar to Thomson's original experiment.

Cathode Ray Deflection

[M | t | ★★★★]
Small Crookes tube with built-in fluorescent screen shows electron beam deflection by magnetic field.

[In-Depth Description]

Maltese Cross CRT

[M | t | ★★★]
Maltese cross obstacle and fluorescing glass show that electrons in a Crookes tube travel in straight lines and are affected by magnetic fields.

[In-Depth Description]

TV Image Deflection

[L | t+ | ★★]
Image on black and white television is deflected by a magnet, not unlike the Maltese Cross.

[In-Depth Description]

Bremsstrahlung and X-Rays

[M | t+ | ★★★]
X-rays are given off by the stopping of electrons in the Maltese Cross CRT; a glass plate in front of detector shows they are "soft" x-rays.

[In-Depth Description]

NMR in Earth's Magnetic Field

[L | t+++ | —]
Hear the protons sing their FID! NMR frequency is in the audio range for earth's field. Videotape of actual experiment.

NMR Model

[M | t+ | —]
Gyro (with axially mounted magnets) positioned inside Helmholtz coils; field is switched by hand at "Larmor frequency" to flip the spinning gyro.

[In-Depth Description]

Reversible Fluid Mixing

[M | t+ | ★★★★]
Surprising reversibility at low Reynolds number. Also a mechanical analog of spin echoes in NMR.

[In-Depth Description]

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