• Pixel-art Tallywick, the Dark-Count Lamplighter, on a black mug with the slogan "IN THE DARK, SOMETHING STILL CLICKS."

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Tallywick, the Dark-Count Lamplighter Mug

\[J = A T^{2} e^{-W/kT}\]
$21.99 USD
$21.99 USD
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Thermionic emission: J = A T² e−W/kT (Richardson–Dushman). It is why photomultipliers have dark counts and why they are cooled.

The joke: Dark counts are thermal electrons leaving the photocathode; cooling suppresses them exponentially. The slogan on the mug reads IN THE DARK, SOMETHING STILL CLICKS.

Source: S. Dushman, Phys. Rev. 21, 623 (1923); O. W. Richardson, Nobel Lecture (1929).

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.

Delivery times & where we ship

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.

Full refund & replacement policy

The physics

Thermionic emission: J = A T² e⁻ᵂᐟᵏᵀ (Richardson–Dushman). It is why photomultipliers have dark counts and why they are cooled.

The joke: Dark counts are thermal electrons leaving the photocathode; cooling suppresses them exponentially. The slogan on the mug reads IN THE DARK, SOMETHING STILL CLICKS.

Source: S. Dushman, Phys. Rev. 21, 623 (1923); O. W. Richardson, Nobel Lecture (1929).

Equations

\[J = A T^{2} e^{-W/kT}\]
SymbolMeaningUnit
\(J\) emitted current density \(\mathrm{A/m^2}\)
\(A\) Richardson constant \(\mathrm{A/(m^2·K^2)}\)
\(T\) cathode temperature \(\mathrm{K}\)
\(W\) work function \(\mathrm{J}\)
\(k\) Boltzmann constant \(\mathrm{J/K}\)

Sources

  1. S. Dushman, Phys. Rev. 21, 623 (1923)
  2. O. W. Richardson, Nobel Lecture (1929)

Field notes

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