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Foraminifera shells are composed of calcium carbonate (CaCO 3) and are found in many common geological environments.The ratio of 18 O to 16 O in the shell is used to indirectly determine the temperature of the surrounding water at the time the shell was formed. The ratio varies slightly depending on the temperature of the surrounding water, as well as other factors such as the water's salinity. (6.0 x 10^5) x (3.0 x 10^4) = a. (5 x 10^-2) ÷ (2 x 10^3) = a. (2.56 x 10^6) x (3.56 x 10^2) = a. 9.1136 x 10^12 b. 91.136 x 10^8 c. 9.1136 x 10^8 d. 91.136 x 10^12 4. In a recent year, the population of California was about 2.52 x 10^7 people. Its land area is about 4.05 x 10^5. For the Love of Physics - Walter Lewin - May 16, 2011 - Duration: 1:01:26. Lectures by Walter Lewin. They will make you ♥ Physics. Recommended for you.
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The debye (symbol: D) (/dɛˈbaɪ/;[1]Dutch: [dəˈbɛiə]) is a CGS unit[2] (a non-SImetric unit) of electric dipole moment[note 1] named in honour of the physicist Peter J. W. Debye. It is defined as 1×10−18statcoulomb-centimeters.[note 2] Historically the debye was defined as the dipole moment resulting from two charges of opposite sign but an equal magnitude of 10−10 statcoulomb[note 3] (generally called e.s.u. (electrostatic unit) in older literature), which were separated by 1 Ångström.[note 4] This gave a convenient unit for molecular dipole moments.
1 D | = 10−18 statC·cm |
= 10−10 esu·Å[note 2] | |
= 1⁄299,792,458×10−21C·m[note 5] | |
≈ 3.33564×10−30 C·m | |
≈ 1.1004×1023qPlP | |
≈ 0.3934303 ea0[3] | |
≈ 0.2081943 eÅ | |
≈ 0.02081943 e·nm |
Typical dipole moments for simple diatomic molecules are in the range of 0 to 11 D. Symmetric homoatomic species, e.g. chlorine, Cl2, have zero dipole moment, and highly ionic molecular species have a very large dipole moment, e.g. gas-phase potassium bromide, KBr, with a dipole moment of 10.5 D.[4]
The debye is still used in atomic physics and chemistry because SI units are inconveniently large. The smallest SI unit of electric dipole moment is the yoctocoulomb-meter, which is roughly 300,000 D.[note 6] There is currently no satisfactory solution to this problem of notation without resorting to the use of scientific notation. Pdf expert edit and sign pdf 2 4 30.
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See also[edit]
- Buckingham (unit) (CGS unit of electric quadrupole)
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Notes[edit]
- ^Electric dipole moment is defined as charge times displacement:
- p = qr.
- ^ abThe statcoulomb is also known as the franklin or electrostatic unit of charge.
- 1 statC = 1 Fr = 1 esu.
- ^10−10 statcoulomb is approximately 0.2083 units of elementary charge.
- ^The ångström is of an order of magnitude close to that of a typical covalent bond.
- 1 Å = 100 pm = 10−8 cm = 10−10 m.
- ^One debye equals 1×10−21 C·m2/s divided by the speed of light in vacuum. Conversely, 1 C·m = 2.9979×1029 D.
- ^Yocto-, with a value of 10−24, is the smallest SI prefix. Note that SI disallows the application of prefixes to both members of a compound unit or the compounding of prefixes, thus ruling out such units as the femtocoulomb-femtometre or the microyoctocoulomb-metre (both approximately 0.3 D) respectively.
References[edit]
- ^'Debye'. Random House Dictionary. 2013.
- ^CGS units R. Rowlett (University of North Carolina at Chapel Hill).
- ^Atomic unit of electric dipole moment, NIST.
- ^Physical chemistry 2d Edition (1966) G. M. Barrow. McGraw-Hill.
Retrieved from 'https://en.wikipedia.org/w/index.php?title=Debye&oldid=948679333'