The extinction of starlight due to the interstellar medium I. is the greatest in the ultraviolet. II. is the greatest in the infrared. III. is caused by ionized hydrogen. IV. is caused by dust particles
a. I & III
b. II & III
c. I & IV
d. II & IV
e. only IV
C
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In order, from top to bottom, in the activity series come K, Zn, Pb, H, Cu, and Au. Therefore,
a. adding Pb to ZnCl2 will release Zn. b. adding Cu to HCl will release hydrogen. c. adding Au to HCl will release hydrogen. d. adding Cu to AuCl3 will release Au.
Al is moving by you at a very high speed (close to the speed of light). You get out a clock and measure 10 seconds going by. If you also watch a clock in Al's ship, how much time will you see it record during your 10 seconds?
A) Al's clock will record less than 10 seconds. B) Al's clock will record more than 10 seconds. C) Al's clock will agree that 10 seconds go by.
Of the following list, the one that gives the smallest average ionizing radiation dose per person per year is
A) nuclear power plants in normal operation. B) cosmic rays. C) the rocks and soil of Earth. D) radon gas. E) medical X-rays.
Ref. 210 suggests that natural gas should be used to produce motor fuels. Discuss the reasonableness of this proposal, given that this is feasible
What will be an ideal response?