5. Draw isobars (lines of constant atmospheric pressure) with a contour interval
ID: 115708 • Letter: 5
Question
5. Draw isobars (lines of constant atmospheric pressure) with a contour interval of 4 mb on the weather map starting with 1000 mb. (a) Locate and identify the low pressure cen- ter (L). (b) Locate and identify the two fronts on the map by looking for changes in air temperature, wind direction, dew point temperature, and cloud cover. Use appropriate symbolism when you draw the frontal boundaries 05 W 100 85 W 75-W 147 48 078 58 40 N 031/60 37 5 63 64 75 095 57 136 39 Roanoke 57 76 75 72 Little 72 113 69 59124 38 79 111 72 76 73 78 72 0 100 200 300 Miles 0 100 200 300 400 500 KillometersExplanation / Answer
ANSWER:
Isobars are atoms (nuclides) of different chemical elements that have the same number of nucleons. Correspondingly, isobars differ in atomic number (or number of protons) but have the same mass number. An example of a series of isobars would be 40S, 40Cl, 40Ar, 40K, and 40Ca. The nuclei of these nuclides all contain 40 nucleons; however, they contain varying numbers of protons and neutrons.
The term "isobars" (originally "isobares") for nuclides was suggested by Alfred Walter Stewart in 1918. It is derived from the Greekword isos, meaning "equal" and baros, meaning "weight
where mass number A equals to the sum of atomic number Z and number of neutrons N, and mp, mn, aV, aS, aC, aA are constants, one can see that the mass depends on Z and N non-linearly, even for a constant mass number. For odd A, it is admitted that = 0 and the mass dependence on Z is convex (or on N or N Z, it does not matter for a constant A). This explains that beta-decay is energetically favorable for neutron-rich nuclides, and positron decay is favorable for strongly neutron-deficient nuclides. Both decay modes do not change the mass number, hence an original nucleus and its daughter nucleus are isobars. In both aforementioned cases, a heavier nucleus decays to its lighter isobar.
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