What is the wavelength of the photon emitted when an electron in a hydrogen atom which is in the initial state n = 8 jumps to the final state n = 2?
(c = 3.00 × 108 m/s, h = 6.626 × 10-34 J ? s, 1 eV = 1.60 × 10-19 J)
A) 486 nm B) 205 nm C) 104 nm D) 610 nm E) 389 nm
E
You might also like to view...
Laboratory experiments conducted with particle accelerators confirm predictions made by the theory that unifies ________
A) the strong, weak, and electromagnetic forces into the GUT force B) the electromagnetic and weak forces into the electroweak force C) the unification of all four forces into a single "superforce" D) the strong and weak forces into the combined nuclear force
The specific heat of ice is 2.100 kJ/kg 
the heat of fusion for ice at 0
is 333.7 kJ/kg, the specific heat of water 4.186 kJ/kg 
and the heat of vaporization of water at 100.0
is 2,256 kJ/kg. What is the final equilibrium temperature when 10.00 grams of ice at -15 
is mixed with 3.000 grams of steam at 100
?
A. 87.21
B. 85.32
C. 82.56
D. 80.12
E. 78.45
If the objects seen in the past are galaxies, how might they have changed?
A. Galaxies would have had less star formation in the past than at present. B. There were more ellipticals in the past and would be spirals at present. C. Things would have had a larger mass in the past than at present. D. They would have been destroyed by supernovae explosions by the present time. E. The galaxies were more irregular and patchy in the past than they are at present.
In this photo, water drops produce disturbances that move outward in circular patterns. What moves outward as drops hit the water's surface? (Hint: If a cork were floating on the water's surface, what would be its motion?)
a. The water at the surface. b. The energy of neighboring water molecules. c. Both a. and b.