The electromagnetic waves with the greatest frequency
on the spectrum are the ones we call "gamma rays".
The electromagnetic waves with the lowest frequency
on the spectrum are the ones we call "radio waves".
Answer:
The flow area at the location where the Mach number is 0.9 is 25.24 cm²
Explanation:
Here we have for isentropic flow;
![\frac{A}{A^*} = \frac{1}{M}(\frac{2}{k+1} (1+\frac{k-1}{2}M^2))^{(\frac{k+1}{2(k-1)} )](https://tex.z-dn.net/?f=%5Cfrac%7BA%7D%7BA%5E%2A%7D%20%3D%20%5Cfrac%7B1%7D%7BM%7D%28%5Cfrac%7B2%7D%7Bk%2B1%7D%20%281%2B%5Cfrac%7Bk-1%7D%7B2%7DM%5E2%29%29%5E%7B%28%5Cfrac%7Bk%2B1%7D%7B2%28k-1%29%7D%20%29)
Where:
A = Area of flow = 36 cm²
M = Mach number at section of = 1.8
k = Specific heat ratio = 1.4
A* = Area at the throat
Therefore, plugging the values we get
![\frac{36}{A^*} = \frac{1}{1.8}(\frac{2}{1.4+1} (1+\frac{1.4-1}{2}1.8^2))^{(\frac{1.4+1}{2(1.4-1)} ) = 1.439](https://tex.z-dn.net/?f=%5Cfrac%7B36%7D%7BA%5E%2A%7D%20%3D%20%5Cfrac%7B1%7D%7B1.8%7D%28%5Cfrac%7B2%7D%7B1.4%2B1%7D%20%281%2B%5Cfrac%7B1.4-1%7D%7B2%7D1.8%5E2%29%29%5E%7B%28%5Cfrac%7B1.4%2B1%7D%7B2%281.4-1%29%7D%20%29%20%3D%201.439)
Therefore, A* = 36/1.439 = 25.01769 cm²
Where the Mach number is 0.9, we have
![\frac{A}{25.02} = \frac{1}{0.9}(\frac{2}{1.4+1} (1+\frac{1.4-1}{2}0.9^2))^{(\frac{1.4+1}{2(1.4-1)} ) = 1.009](https://tex.z-dn.net/?f=%5Cfrac%7BA%7D%7B25.02%7D%20%3D%20%5Cfrac%7B1%7D%7B0.9%7D%28%5Cfrac%7B2%7D%7B1.4%2B1%7D%20%281%2B%5Cfrac%7B1.4-1%7D%7B2%7D0.9%5E2%29%29%5E%7B%28%5Cfrac%7B1.4%2B1%7D%7B2%281.4-1%29%7D%20%29%20%3D%201.009)
Therefore A = 25.020× 1.009 = 25.24 cm²
The flow area at the location where the Mach number is 0.9 = 25.24 cm².
The answer to that question is C
Explanation:
formation of compounds because the electric forces compel the atoms to attract each other and formed bonds which leads to the formation of chemical compounds. The attractive or repulsive interaction between any two charged bodies is known as an electric force so the attraction between two opposite charged atoms causes the formation of compounds so we can conclude that electric forces are important for the formation of compounds.