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Description
Laser Double-Slit STEM Box (includes 12 different "Beam-Splitters")This new and improved STEM Box includes everything you need to achieve an interference pattern with a laser in less than 60 seconds, like Thomas Young's classic double slit experiment (we love the following animation of how light is thought to propagate past a double slit, from: File: Double slit experiment. webm Wikipedia) : Your browser does not support the video tag. What's New: No wire or tape needed 12 different widths of "Beam splitter" Hand
This new and improved STEM Box includes everything you need to achieve an interference pattern with a laser in less than 60 seconds, like Thomas Young's classic double-slit experiment (we love the following animation of how light is thought to propagate past a double-slit, from: File:Double slit experiment.webm - Wikipedia) :
What's New:
- No wire or tape needed
- 12 different widths of "Beam-splitter"
- Hand-crafted from Canadian Maple
- Brushed aluminum backing
Included:
(1) Class IIIA, or 3R red laser, serving as a coherent light source. Power of <5mW, and wavelength of ~650nm. Your choice of body colour for the laser (as supplies last).
* Class 3A laser, also known as Class IIIA or 3R laser, is a low-powered laser that emits visible light between 1 and 4.99 milliwatts. It is considered safe when handled carefully, but it may cause eye damage if stared into or viewed with optical devices such as binoculars or microscopes. It is not a skin or material burn hazard. It is the maximum class allowed for laser pointers in the USA and Canada (from Per Chat GPT 4.0, on Mar-24-23).
(2) Double-Slit Assembly, serving as a way to split the coherent laser light beam into a diffraction pattern. Includes 12 very thin wires, from AWG 28 to AWG 50. Handmade in Canada of locally-sourced Canadian Maple. Dimensions are 180mm Length x 31 mm width x 9 mm height. Mass: 41 grams (approx.) (excl. jewel case).
(3) Straight-forward step-by-step illustrated instructions (for an adult) so that you can easily and successfully perform the double-slit experiment at home in less than 60 seconds
(Hint: we find it works best to hold the assembly at least ~1 meter from a wall or other screen, and that anything closer than ~0.5 meters becomes quite difficult to see).
(4) A kid-friendly explanation of the experiment.
Using the materials in this STEM Box, you can see for yourself how different wire widths, distances, orientations, etc. affect the laser interference pattern.
You might also wonder: how does the wavelength of red laser light (about 650nm, or 650 billionths of a meter) compare to the thickness of the 12 different sized wires included in the Assembly (the "beam-splitters")? Table A provides this information, and we've also laser-engraved most of it on each Assembly for easy reference using a Glowforge laser:
We've included in Table A a "Multiple of Wavelength of Red laser light" (far right column) to give users a physical sense of how vanishingly small 650nm really is. We find the tiniest wire (AWG 50) to be barely visible, and yet its 0.025mm thickness is still equal in length to 39 full wavelengths of 650nm red light (!!!).
For a brief demonstration of how the double-slit experiment can be performed at home using a laser, electrical tape, and AWG 32 wire, check out the following video that inspried us early on:
For the truly daring (and make sure you're sitting down for this little dose of reality), check out this video:
And more recently, check out these videos from Floathead Physics, Fermilab, Answers with Joe, and Astrum:
Recommended for Age 12 & Up (with adult supervision)
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4.6 ★★★★★
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★★★★★ 5
Great read
Format: Kindle
I really like this one. Even though the Poppy character is a bit stubborn and won’t accept she is not really a detective, yet. The rest of the characters and plot delightful. I’m already looking forward to the next one.
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Reviewed in the United States on June 12, 2025
★★★★★ 4
Enjoyable
Format: Kindle
It is a good read. I enjoy the leafing characters. The plot was well done.
But it could use a bit of better editing. There were several mistakes.
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Reviewed in the United States on October 31, 2025
★★★★★ 5
as an addition to the Scottish Ladies Detective agency, a new lady sleuth
Format: Kindle
What a wonderful mystery, a grand heroine who is polishing her detective skills.
All the pomp of the gentile classes at their play. Murders, theft, and dogs in the highlands, what could be better?
Recommend
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Reviewed in the United States on May 21, 2025
★★★★★ 3
Promising start to new mystery series.
Format: Kindle
Lady Persephone "Poppy" Proudfoot attends a house party at an estate, meets some American actors, and tries to solve the murder of a stranger to the village whose body is discovered by the lake. The first in a series, this book is a quick read with a plot that moves along, although some of the large cast of characters seem superfluous (e.g., the American visitors). Poppy is a widow, a law-school graduate (in the 1920s!), and ran a hospital for wounded soldiers during WW1, so an interesting character to read about. A promising beginning to the series and I look forward to the next book. Thanks to Netgalley and Bookouture for the eARC.
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Reviewed in the United States on August 10, 2025
★★★★★ 5
Good quality
light and blends pretty well
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Reviewed in the United States on February 6, 2026