What is the difference in wavelength for spectral lines emitted by hydrogen for transitions from the n = 16 level to the n = 2 level and transitions from the n = 15 level to the n = 2 level? (RH = 1.097 × 10^7 m?1.)
a. 1.0 × 10^?10 m
b. 2.0 × 10^?10 m
c. 4.1 × 10^?10 m
d. 8.1 × 10^?10 m
e. 1.6 × 10^?9 m
d
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Four identical 2.5-mF capacitors are connected together electrically. What is the greatest possible capacitance of the combination?
a. 0.50 mF b. 0.42 mF c. 0.63 mF d. 10 mF e. 0.40 mF
A spiral galaxy with an extremely luminous, active core is called a(n) _______________ galaxy
Fill in the blank(s) with correct word
Induced emf in a straight segment of wire that passes through a magnetic field depends on all of the following, except:
A. the orientation of the wire with respect to the magnetic field direction B. its length, its resistance C. its speed D. the magnetic field strength
Specific Heat: In grinding a steel knife, the metal can get as hot as 400°C. If the blade has a mass of 80 g, what is the minimum amount of water needed at 20°C if the water is to remain liquid and not rise above 100°C when the hot blade is quenched in it? The specific heat of the steel is 0.11 cal/g ? C° and the specific heat of water is 1.0 cal/g ? C°.
A. 22 g B. 33 g C. 44 g D. 55 g