Hydrogen is generally classified as a

a. semimetal.
b. nonmetal.
c. metal.
d. noble gas.


b

Physics & Space Science

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What factor is not in the Drake Equation?

A: Fraction of stars with planets B: Number of habitable planets per star with planets C: Communication lag due to large distances between stars D: Fraction of life-bearing planets on which intelligence involves E: Average lifetime of a technologically competent civilization

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Exclusion Principle: Neon has 10 electrons. What is the value of Z of the next higher element that has chemical properties very similar to those of neon?

A. 11 B. 17 C. 18 D. 19 E. 36

Physics & Space Science

Maxwell developed his theory of electromagnetism by combining previous discoveries. He added his own original hypothesis that:

a. electric charges produce electric fields. b. moving electric charges produce magnetic fields. c. changing electric fields produce magnetic fields. d. changing magnetic fields produce electric fields.

Physics & Space Science

If a spherical galaxy of diameter 100,000 ly contained enough mass to be a black hole, what would be its mass?

A) 200 x 109 kg B) 400 x 109 kg C) 6.9 x 1023 kg D) 3.2 x 1047 kg E) 6.4 x 1047 kg

Physics & Space Science