The wavelength of the emitted photon when a hydrogen atom makes a transition from the n = 2 state to the ground state is closest to which of the following values? (c = 3.0 108 m/s, h = 6.626 10-34 J s, 1 eV = 1.60 10-19 J)
A) 122 nm
B) 203 nm
C) 243 nm
D) 389 nm
E) 411 nm
Question 2
A 1.0-C point charge is 15 m from a second point charge, and the electric force on one of them due to the other is 1.0 N. What is the magnitude of the second charge? (k = 1/40 = 8.99 109 N m2/C2)
A) 25 C
B) 1.0 C
C) 10 nC
D) 0.025 C
E) 25 nC
The classic stages of the demographic transition.
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