What is the wavelength of the emitted photon if an electron in the hydrogen atom makes a transition from n = 2 state to the ground state?
A) 121.5 nm
B) 203.1 nm
C) 243.0 nm
D) 388.8 nm
E) 411.1 nm
A
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Energy in Inductors: You need an inductor that will store 20 J of energy when a 3.0-A current flows through it. What should be its self-inductance?
A. 4.4 H B. 90 H C. 60 H D. 3.7 H
Equilibrium: A light board that is 10 m long is supported by two sawhorses, one at one end of the board and a second at the midpoint. A 40-N object is placed between the two sawhorses, 3.0 m from the end and 2.0 m from the center. A second object, with a weight of 15 N, is placed on the supported end. What magnitude forces do the sawhorses exert on the board?
What will be an ideal response?
How many water molecules are there in 36. g of water? Express your answer as a multiple of Avogadro's number NA. (The molecular structure of a water molecule is H2O.)
A) 18. NA B) 2.0 NA C) 36. NA D) 3.0 NA E) 0.020 NA
As of right now, the universe is apparently composed of ________ visible baryonic matter, _________ undetectable "dark" matter, and __________ undetectable "dark" energy. (Fill in the missing blanks.)