A __ is a large geographic area with a climate that supports distinctive plant and animal groups.
Fill in the blank(s) with the appropriate word(s).
Ans: biome
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The wavelengths of the sounds produced by two horns are 6.0 m and 7.0 m, respectively. What beat frequency is heard when the horns are sounded on a day when the speed of sound is 340 m/s?
A) 5 Hz B) 6 Hz C) 7 Hz D) 8 Hz
A transverse wave travels at 190 m/s along the x-axis. If the period of the periodic vibrations of the wave is 2.6 milliseconds, then what is the wavelength of the wave?
A. 25.5 cm B. 35.4 cm C. 49.4 cm D. 50.3 cm E. 54.4 cm
Why is 2,4,5-trifluorophenol much more acidic than phenol?
A) The fluorines adjacent to the OH group are large and shield the hydroxl group from making the solution basic. B) The fluorines de-stabilize the benzene ring and thus give the structure more acidic characteristics. C) The fluorines have high electronegativities and help to stabilize the negative charges, which makes it even easier for the hydrogen to be lost. D) False! 2,4,5-trifluorophenol is actually not more acidic than phenol.
Each photon in a beam of light has an energy of 4.20 eV. What is the wavelength of this light? (c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)
A) 321 nm B) 103 nm C) 296 nm D) 412 nm E) 420 nm