Significant Figures: The number of significant figures in 0.040 is
A. one.
B. two.
C. three.
D. four.
Answer: B
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Two nuclei which share the same mass number A always are (Hint: Eliminate any wrong answers.)
a. stable. b. unstable. c. isotopes. d. isobars. e. radioactive.
Evidence that things are made of atoms comes from
A) the way that laser beams pass through air. B) the fact that objects accelerate as they fall. C) Brownian motion. D) the fact that we can cut solid objects into smaller and smaller pieces. E) superconductivity.
The inductance of a tuning circuit of an AM radio is 4.00 mH. Find the capacitance of the circuit required for reception at 1200 kHz.
A. 2.10 pF B. 4.40 pF C. 21.2 pF D. 43.4 pF E. 27.6 pF
Which kind of robotic space mission enables us to determine the chemical composition of a planet's surface and atmosphere remotely?
A) sample return B) lander/probe C) orbiter D) flyby