Pelletine, the Grain-Counting Clerk Mug
Shot noise: current made of discrete charges fluctuates with spectral density SI = 2qI. Its size reveals the charge of the carrier.
The joke: Shot noise exists only because e is not zero; physicists measure fractional charge (e/3) this way. The slogan on the mug reads CHARGE COMES IN LUMPS. SO DOES PROGRESS.
Source: W. Schottky, Ann. Phys. 362, 541 (1918).
Shipping calculated at checkout by destinationMade to order, ships in ~10 days
Details
Size & material11oz · 15oz
Black glossy ceramic mug with a C-handle. Lead- and BPA-free.
- 11oz: 0.33 l
- 15oz: 0.44 l
CareDishwasher & microwave safe
Dishwasher safe (top rack) or hand wash. Microwave safe.
ShippingBy destination
Shipping calculated at checkout by destination.
Made to order: about 10 days of production and handling before it ships.
Returns & replacements21 days
Every item is printed to order, so we can’t accept returns or exchanges for change of mind, or if you ordered the wrong size or colour.
Print defect, misprint, damage or the wrong item? We’ll send a free replacement, or a refund if you prefer. Report it within 21 days of delivery with a photo; no need to send it back.
The physics
Equations
| Symbol | Meaning | Unit |
|---|---|---|
| \(S_I\) | current noise spectral density | \(\mathrm{A^2/Hz}\) |
| \(q\) | charge of the carrier | \(\mathrm{C}\) |
| \(I\) | mean current | \(\mathrm{A}\) |
Field notes
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