Which of the following is NOT an ion?
A) H+1
B) Br-
C) O2
D) Mg+2
E) NO3-
Answer: C
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The air in a pipe resonates at 120 Hz and 600 Hz, one of these resonances being the fundamental. If the pipe is open at both ends, how many resonances are between the two given ones, and if the pipe is closed at one end, how many resonances are between the two given ones?
a. open: 3; closed: 1 b. open: 1; closed: 3 c. open: 2; closed: 0 d. open: 0; closed: 2 e. open: 5; closed: 1
One of the patterns that shows up nicely in the periodic table is that similar chemical properties
A. make great batteries, if you choose a metal from two separate rows. B. are displayed by elements in the same column. C. correlate to the mass of each element on a row. D. exist on each diagonal, starting with hydrogen, then lithium, and so forth.
A skydiver's terminal velocity will be greatest if she falls
A) head first. B) lying flat on her back. C) lying flat on her stomach. D) with her parachute open.
The background stars during a solar eclipse are those of constellations
A) of the opposite season. B) seen in the nighttime sky. C) not seen normally. D) seen in the opposite hemisphere.