Which of the following polyatomic ions has a doubly negative charge?

a. Acetate
b. Sulfate
c. Phosphate
d. Ammonium


b

Physics & Space Science

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Answer the following statement true (T) or false (F)

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A tiny 0.0250-µg oil drop containing 15 excess electrons is suspended between two horizontally closely-spaced metal plates that carry equal but opposite charges on their facing surfaces

The plates are both circular with a radius of 6.50 cm. (k = 1/4??0 = 9.0 × 109 N ? m2/C2, e = 1.6 × 10-19 C) (a) How much excess charge must be on each plate to hold the oil drop steady? (b) Which plate must be positive, the upper one or the lower one?

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In the standard model, about when after the Big Bang did the universe become transparent to radiation?

A) 10-43 s B) 10-35 s C) 103 s D) 3 × 105 y E) 3 × 106 y

Physics & Space Science

Earth's magnetic field is

A) something we've learned to live with. B) useful to pigeons but not to humans. C) protective to life on Earth.

Physics & Space Science