The Angstrom is named after Anders Jon Angstrom. He was a founder of spectroscopy, so the Angstrom is used to measure the wavelengths of light.
2. A Furlong?
Answer: 220 yards
Furlong is a 14th century Old English measurement. In Old English a furlong equals: 40 poles, 1,000 links, 201.168 meters, 10 chains and .125 mile.
3. A vara?
Answer: 33.33 inches
The vara was used in old Spanish American and Texan land maps. A vara equals: .8467 meters, 4.2088 links and 2.777 feet.
4. A Hide?
Answer: 120 acres
A hide is the Old English unit of land area. It is equal to: 48.562 hectares, 0.486 sq. kilometers and 0.187 square miles.
5. A Micrometer?
Answer: One millionth of a meter
Microns are used on CDs. A laser reads the microns off the disk and plays music. A typical bump on a CD is 0.5 microns wide and 1.6 microns separate the bumps.
6. An icosahedron?
Answer: A 20 sided figure
The icosahedron is in the icosahedral symmetry group. It has 30 edges and 12 vertices. The vertex configuration is 3,3,3,3,3. Vertex configuration is the sequence of faces arranged around a vertex.
7. A Hectare?
Answer: 10,000 meters^2
Hectare is the customary unit of land area. It is derived from the Greek word hekaton for 100. A hectare is equal to 100 ares, with an are being equal to 100 square meters.
8. A nanometer?
Answer: One billionth of a meter
Nano is from the Greek "nanos" meaning dwarf. A nano is 10^-9.
9. A theta wave?
Answer: Between 4 and 9 hertz
The theta wave is a brain frequency. It mainly occurs in the cortex and hippocampus part of the brain.
10. A pico?
Answer: One trillionth of a gram
A picogram is 10^-12. It is from the Spanish "pico" meaning very small amount.
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