The average mass per nucleon is greatest in which of the following elements?
a. hydrogen
b. iron
c. uranium
d. krypton
a
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A 10.0 kg ball weighs 98.0 N in air and weighs 65.0 N when submerged in water. The volume of the ball is
A. 0.00337 
B. 0.00457
C. 0.00766
D. 0.00980
E. 0.00245
If the radius of the electron orbit in the n = 1 level of the hydrogen atoms is 0.052 9 nm, what is its radius for the n = 4 level? (Assume the Bohr model is valid)
a. 0.212 nm b. 0.045 nm c. 0.716 nm d. 0.846 nm e. 0.920 nm
A 200-Hz and a 206-Hz sound are emitted into the same volume of space. What is the frequency of intensity variation?
A) 406 Hz B) 41.2 kHz C) 6 Hz D) 1.03 Hz E) 203 Hz
How does the unified model of AGN explain blazars?
a. Blazars are Seyferts galaxies seen edge on. b. Blazars are regions of the intergalactic medium where gas has been heated by a nearby AGN. c. Blazars are relativistic jets from an AGN pointed toward our light of sight. d. Blazars are newly formed AGN from a recently galactic collision.