In the mid-19th century, what was the single largest cause of death?
What will be an ideal response?
Tuberculosis
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In addition to those of Groups 1A and 2A, three common elements that form only one ion each are
a. Sc, Ti, and Hg. b. Pb, Sn, and Cu. c. Al, Zn, and Ag. d. Ga, Ni, and Fe.
Of the various types of electromagnetic radiation, which is the most penetrating through all forms of matter?
a. infrared b. gamma c. visible light d. ultraviolet
Energy in the Electric Field: A uniform electric field has the strength of 7.0 N/C. What is the electric energy density of this field? (?0 = 8.85 × 10-12 C2/N ? m2)
A. 2.2 × 10-10 J/m3 B. 3.1 × 10-11 J/m3 C. 2.8 × 1012 J/m3 D. 5.5 × 1012 J/m3
Which of the following is not a pattern of motion in our solar system?
A) Planets all orbit in the same direction. B) Planets all rotate in the same direction. C) Planets all orbit the same direction as the Sun's spin. D) Large planets all have many moons orbiting them.