Comparing the size of a wavelength of light with the size of an atom,
A) some atoms are are larger than a lightwave, but others are small than a lightwave.
B) atoms are much smaller.
C) atoms are much larger.
D) they are about the same size.
E) some lightwaves are larger than atoms, but others are smaller than atoms.
B
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The following three appliances are connected to a 120-V house circuit: i) toaster, 1 325 W, ii) coffee pot, 650 W, and iii) microwave, 600 W. If all were operated at the same time, what total current would they draw?
a. 2.10 A b. 47.5 A c. 7.15 A d. 21.5 A e. 11.0 A
Calorimetry: A 360-g metal container, insulated on the outside, holds 180.0 g of water in thermal equilibrium at 22.0°C. A 24.0-g ice cube, at the melting point, is dropped into the water, and when thermal equilibrium is reached the temperature is 15.0°C. Assume there is no heat exchange with the surroundings. For water, the specific heat capacity is 4190 J/kg ? K and the heat of fusion is 3.34 × 105 J/kg. What is the specific heat capacity of the metal of the container?
A. 1700 J/kg ? K B. 970 J/kg ? K C. 2300 J/kg ? K D. 2800 J/kg ? K E. 3300 J/kg ? K
Jupiter completes one revolution about its own axis every 9.92 hours. What is the radius of the orbit required for a satellite to revolve about Jupiter with the same period? Jupiter has a mass of 1.90 × 1027 kg and G = 6.67 x 10-11 N•m2/kg2
A) 1.04 × 107 m B) 2.26 × 109 m C) 1.60 × 108 m D) 3.41 × 108 m E) 7.45 × 108 m
Which properties of spiral galaxies allow us to subclassify them as Sa, Sb, or Sc?
A) orientation B) size of the disk C) shape of the halo D) size of bulge and extent of spiral arms E) color of stars in the disk