With what color light would you expect to be able to see the greatest detail when using a microscope?
A) blue, because it is brighter
B) red, because of its long wavelength
C) blue, because of its shorter wavelength
D) red, because it is refracted less than other colors by glass
E) The color makes no difference in the resolving power, since this is determined only by the diameter of the lenses.
C
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If we say that a galaxy has a lookback time of 1 billion years, we mean that
A) its light traveled through space for 1 billion years to reach us. B) it is now 1 billion light-years away. C) it was 1 billion light-years away when the light left the galaxy. D) it is 400 million years old.
At an instant when a particle of mass 80 g has a velocity of 25 m/s in the positive y direction, a 75-g particle has a velocity of 20 m/s in the positive x direction. What is the speed of the center of mass of this two-particle system at this instant?
a. 16 m/s b. 45 m/s c. 23 m/s d. 20 m/s e. 36 m/s
A 4.00 kg hollow sphere of radius 5.00 cm starts from rest and rolls without slipping down a 30.0 degree incline. If the length of the incline is 50.0 cm, then the velocity of the center of mass of the hollow sphere at the bottom of the incline is
A. 1.28 
B. 1.44
C. 1.65
D. 1.72
E. 1.98
Potassium Iodide (chemical formula: KI) has a face-centered cubic structure (just like sodium chloride). If the distance between crystal planes is d = 0.353 nm and X-rays of wavelength ? = 0.0934 nm are used, what is the smallest angle ? at which a diffraction maximum may be obtained?
A. 9.92° B. 7.60° C. 13.3° D. 15.5° E. 6.52°