Electromagnetic radiation of wavelength 200. nanometers is which type?
A) X-rays
B) ultraviolet
C) microwaves
D) AM radio
E) visible
B
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Answer the following statement true (T) or false (F)
Hydrogen is generally classified as a
a. semimetal. b. nonmetal. c. metal. d. noble gas.
During the Carboniferous Period,
A) the carbon dioxide cycle started to operate for the first time B) carbon-rich meteorites impacted the Earth C) the first carbon-based life appeared D) land was covered with dense forests with the appearance of the first insects and amphibians
The aircraft that generates a shock wave will fly at
1) half the speed of sound. 2) exactly the speed of sound. 3) twice the speed of sound. 4) all of these. A sonic boom is produced by a missile traveling 5) near the speed of sound. 6) at the speed of sound. 7) only above the speed of sound. 8) near, at, or above the speed of sound.