Answer:
There are no changes in primary atmospheric gases even if height is 18,000 ft.
It feels like oxygen is low at such heights but it is not. At height of 18000 ft oxygen will be same in air (21%) but due to decrease in pressure it will be difficult to breathe.
Explanation:
As we move to higher altitudes, the pressure reduces if we compare it with sea level but the important thing to note is composition of air remains the same which is 78% Nitrogen, 21% oxygen and 1% other gases (including Carbon dioxide). There are no changes in primary atmospheric gases even if height is 18,000 ft but the problem which can be faced is breathing because pressure is low at such height and it will be difficult for lungs to take oxygen in.
It feels like oxygen is low at such height but it is not. At height of 18000 oxygen will be same in air(21%) but due to decrease in pressure it will be difficult to breathe.
Answer:
The correct answer is True.
Explanation:
In the kidney, the handle of Henle is a fork-like tube located in the nephrons. It is the portion of the nephron that leads from the proximal contoured tubule to the distal contoured tubule. The primary filtrate from the glomerulus passes into the proximal contoured tubule, which connects to the descending branch of the loop of Henle, which has low permeability to ions and urea (solutes) but is very permeable to water.
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Explanation:
“The basic principle of mass spectrometry (MS) is to generate ions from either inorganic or organic compounds by any suitable method, to separate these ions by their mass-to-charge ratio (m/z) and to detect them qualitatively and quantitatively by their respective m/z and abundance
Answer:
You determine the weighted averages if the individual isotopic masses.
Procedure:
The atomic mass of Si is the <em>weighted average </em>of the atomic masses of its isotopes.
We multiply the atomic mass of each isotope by a number representing its relative importance (i.e., its percent abundance).
The three stable isotopes of Si are Si-28 (27.98 u, 92.22 %), Si-29 (28.98 u, 4.69 %), and Si-30 (29.97 u, 3.09 %).
Set up a table for easy calculation.
0.9222 × 27.89 u = <em>x</em> u
0.0469 × 28.98 u = <em>y</em> u
0.0309 × 29.97 u = <em>z</em> u
TOTAL = (<em>x</em>+<em>y</em>+<em>z</em>) u = atomic mass of Si.