A class of pollutants formed at high temperatures (nearly complete combustion) in the presence of air is ______________
Fill in the blank(s) with correct word
nitrogen oxides
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Two identical iron spheres have equal positive charges and the force between them when they are 1 m apart is 2 N. What percentage of the electrons has been removed from each sphere if each sphere has 1 mole (6 × 10^23) of iron atoms? (ke = 8.99 × 10^9 N/m2/C2, the atomic number of iron is 26, and the electron charge is ?1.6 × 10^?19 C)
a. 0.001% b. 0.000 002% c. 1 × 10^?8 % d. 6 × 10^?10 % e. 6 × 10^?12 %
Red sunsets are due to light of lower frequencies that
A) are scattered from larger particles in the air. B) are scattered from smaller particles in the air. C) survive being scattered in the air. D) are reflected by clouds and relatively large particles in the air. E) appear reddish-orange to the eye.
Which of the following statements about quasars is not correct?
A. Their cores are extremely large, probably several thousand light-years across. B. Their spectra have the largest redshifts observed. C. They are probably the most distant observable objects. D. They have abnormally high luminosities. E. Sometimes they appear in pairs, due to gravitational lenses formed by intervening galaxies.
People settle on floodplains because
A) the chance of flooding is very rare. B) floodplain soil is nutrient rich and good for agriculture. C) of river access. D) river access and rich soils.