#  Nuclear and Elementary Particle Physics 

 



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### Rutherford Scattering

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

\[[In-Depth Description](/presentations/rutherford-scattering)\]

### 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.  
  
\[[In-Depth Description](/presentations/potential-well-orbiter)\]

### Roller Coaster Potential

\[M | t | —\]  
One-dimensional model of electron trapped in atomic potential well.  
  
\[[In-Depth Description](/presentations/roller-coaster-potential)\]

### 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.

\[[In-Depth Description](/presentations/crt-paddle-wheel)\]

### 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.  
  
\[[In-Depth Description](/presentations/cathode-ray-deflection)\]

### 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.  
  
\[[In-Depth Description](/presentations/maltese-cross-crt)\]

### TV Image Deflection

\[L | t+ | ★★\]  
Image on *black and white* television is deflected by a magnet, not unlike the Maltese Cross.   
  
\[[In-Depth Description](/presentations/tv-image-deflection)\]

### 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.  
  
\[[In-Depth Description](/presentations/bremsstrahlung-and-x-rays)\]

### 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.  
  
\[[In-Depth Description](/presentations/nmr-model)\]

### Reversible Fluid Mixing

\[M | t+ | ★★★★\]  
Surprising reversibility at low Reynolds number. Also a mechanical analog of spin echoes in NMR.  
  
\[[In-Depth Description](/presentations/reversible-fluid-mixing)\]

### Contact Us

**Mailing Address**: Lecture Demonstration Services, Science Center, Rm B-08A, 1 Oxford Street, Cambridge, MA 02138  
**Campus Location**: Science Center B-08A | **Tel**: (617) 495-5824 | **Email**: scidemos-at-fas.harvard.edu