Physics Principles and Problems 2009

Chapter 28: The Atom

Standardized Test Practice

1
What conclusion did Rutherford reach when he observed that atoms of gold foil could deflect α particles?
A)All of an atom's positive charge and virtually all of its mass are in a tiny central core.
B)Electrons contain so much energy that they can deflect α particles.
C)Electrons are scattered throughout an atom like blueberries in a muffin.
D)The amount of space occupied by the electrons in an atom is insignificant.
2
A hydrogen atom absorbs energy, causing its electron to move from the first to the third energy level. What is the change in the atom's energy?
A)3.19 eV
B)10.2 eV
C)12.1 eV
D)13.6 eV
3
The diagram shows the emission of a photon when a calcium atom drops from the third energy level (n = 3) to the second energy level (n = 2). What is the wavelength of the emitted photon? In what part of the electromagnetic spectrum is this wavelength?

<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0078807220/617936/cj.JPG','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (5.0K)</a>
  Need a Hint?
A)7.50 × 101 nm; infrared
B)2.44 × 102 nm; ultraviolet
C)5.09 × 102 nm; visible
D)1.03 × 103 nm; infrared
4
What idea did Bohr introduce to atomic models?
A)Electrons travel in fixed orbits.
B)Energy levels in an atom are quantized.
C)Electrons have wave properties.
D)Electrons are found in electron clouds.
5
An atom drops from an energy level of –7.64 eV to a lower level and emits a photon with a wavelength of 273 nm. What is the energy of the lower level?
  Need a Hint?
A)–3.36 eV
B)–4.54 eV
C)–11.0 eV
D)–12.2 eV
6
The lasing energy levels of a laser are separated by 1.96 eV. What wavelength of light does it emit? What color is this light?
  Need a Hint?
A)242 nm; ultraviolet
B)420 nm; violet
C)633 nm; red
D)845 nm; infrared
7
What does the quantum model of the atom allow scientists to predict?
A)the exact position and momentum of an electron
B)the radius of an electron's orbit
C)the probability that an electron is in a specific region
D)the angular momentum of an electron
8
The table shows the first five energy levels for mercury. A mercury atom makes a transition that emits a photon with a frequency of 4.91 × 1014 Hz. What was the transition?

<a onClick="window.open('/olcweb/cgi/pluginpop.cgi?it=jpg::::/sites/dl/free/0078807220/617936/ck.jpg','popWin', 'width=NaN,height=NaN,resizable,scrollbars');" href="#"><img valign="absmiddle" height="16" width="16" border="0" src="/olcweb/styles/shared/linkicons/image.gif"> (9.0K)</a>
A)E3 to E1
B)E5 to E2
C)E1 to E3
D)E2 to E5
9
What does the word laser stand for?
A)light amplification by stimulated emission of radiation
B)light amplification by spontaneous emission of radiation
C)light amplification by stimulated excitation of radiation
D)Luke's amazing, stupendous, extraordinary radiation
10
What is meant by the term coherent light?
A)Coherent light is light that always has the same intensity.
B)Coherent light has waves that are at the same point in their cycle at the same time.
C)Coherent light is light that has a continuous spectrum.
D)Coherent light always has waves that were produced by a process known as stimulated emission.
Glencoe Online Learning CenterScience HomeProduct InfoSite MapContact Us

The McGraw-Hill CompaniesGlencoe