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10.16 cm = 1.016 dm – 1 hand used in measuring height of horses (4 inches) 12 cm = 1.2 dm – diameter of a compact disc (CD) (= 120 mm) 15 cm = 1.5 dm – length of a Bic pen with cap on; 22 cm = 2.2 dm – diameter of a typical association football (soccer ball) 30 cm = 3 dm – typical school-use ruler length (= 300 mm)
Millimeter waves show "optical" propagation characteristics and can be reflected and focused by small metal surfaces and dielectric lenses around 5 to 30 cm (2 inches to 1 foot) diameter. Because their wavelengths are often much smaller than the equipment that manipulates them, the techniques of geometric optics can be used.
Super high frequency (SHF) is the ITU designation [1] [2] for radio frequencies (RF) in the range between 3 and 30 gigahertz (GHz). This band of frequencies is also known as the centimetre band or centimetre wave as the wavelengths range from one to ten centimetres.
Bushmeat extraction in the Amazon rainforest was estimated to be much lower, at 3.69 ± 3.9 kg/km 2 (21.1 ± 22.3 lb/sq mi) in the case of species weighing more than 10 kg and 0.6 ± 0.9 kg/km 2 (3.4 ± 5.1 lb/sq mi) in the case of species weighing less than 10 kg, based on 3 individuals.
Frequencies observed in astronomy range from 2.4 × 10 23 Hz (1 GeV gamma rays) down to the local plasma frequency of the ionized interstellar medium (~1 kHz). Wavelength is inversely proportional to the wave frequency, [ 1 ] so gamma rays have very short wavelengths that are fractions of the size of atoms , whereas wavelengths on the opposite ...
The SI unit of molar absorption coefficient is the square metre per mole (m 2 /mol), but in practice, quantities are usually expressed in terms of M −1 ⋅cm −1 or L⋅mol −1 ⋅cm −1 (the latter two units are both equal to 0.1 m 2 /mol). In older literature, the cm 2 /mol is sometimes used; 1 M −1 ⋅cm −1 equals 1000 cm 2 /mol.
The longest distance achieved on 2 mm in the United Kingdom was 35.6 kilometres (22.1 mi) between stations G8ACE and G8KQW on January 16 2016. [ 5 ] In Australia , the 2 mm distance record was 19 kilometres (12 mi) set by stations VK3CV and VK3NH on June 11, 2020.
The African palm civet is threatened by habitat loss and hunting for bushmeat. [1] In 2006, an estimated more than 4,300 African palm civets are hunted yearly in the Nigerian part and around 3,300 in the Cameroon part of the Cross–Sanaga–Bioko coastal forests. [18]