Light is incident on a double-slit. The fourth bright band has an angular distance of 7.0° from the central maximum. What is the distance between the slits (in ?m)? (Assume the frequency of the light is 5.4 × 1014 Hz.)
A. 27
B. 21
C. 24
D. 18
E. 14
Answer: D
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A ball tossed vertically upward reaches its highest point and then falls back to its starting point. During this up-and-down motion the acceleration of the ball is always
A) in the direction of motion. B) opposite its velocity. C) directed upward. D) directed downward.
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.
A particle moves in the xy plane in a circle centered on the origin. At a certain instant the velocity and acceleration of the particle are 
m/s and 
m/s2. What are the x and y coordinates of the particle at this moment?
A. x = ?4.4 m, y = 0 B. x = +5.3 m, y = 0 C. x = ?5.3 m, y = 0 D. x = +4.4 m, y = 0 E. x = ?1.8 m, y = 0
At what temperature would the root mean square speed of oxygen molecules, O2, be if oxygen behaves like an ideal gas? The mass of one O2 molecule is 5.312 × 10-26 kg, and the Boltzmann constant is 1.38 × 10-23 J/K
A) 0.251 K B) 2090 K C) 6270 K D) 1.52 × 1023 K