Summary















kw5
If an electron and a proton have the same speed, which would have the longer wavelength?
A. The electron.
B. The proton.
C. They would have the same wavelength.
Answer







kw5
Which of the following is NOT a feature of the Bohr model of the atom?
A. Electrons in planetary-like orbits.
B. Positively charged material surrounding the electrons.
C. Quantized energy levels.
D. Accelerating electrons that do not radiate.
Answer







kw5
If the electrons in hydrogen atoms are excited to the fourth Bohr orbit, how many different frequencies of light may be emitted?
A. 1         B. 3         C. 4         D. 6
Answer







 



A. The electron.

The de Broglie hypothesis says the wavelength of a particle's matter wave is inversely proportional to its momentum. Therefore the smaller mass and smaller momentum of the electron means that it has a longer wavelength.














 



B. Positively charged material surrounding the electrons.

The Bohr model retains Rutherford's compact nucleus as the location of all the positive charge in an atom. The Thomson "plum pudding" model is the one that has a positively charged "pudding" surrounding the negatively charged electrons.














 



D. 6

If the electron jumps from the n = 4 to the n = 3 level, it can then also jump from 3 Picture (34x22, 339 bytes) 2, 3 Picture (34x22, 339 bytes) 1, or 2 Picture (34x22, 339 bytes) 1. Each of those four transitions would release a photon of a unique energy or color. Two other unique colors would result from 4 Picture (34x22, 339 bytes) 2 and 4 Picture (34x22, 339 bytes) 1 jumps, for a total of 6 unique colors.