When ignited, a uranium compound burns with a green flame. The wavelength of the light given off by this flame is greater than that of
A.
red light.
B.
infrared light.
C.
radio waves.
D.
ultraviolet light.
E.
none of these
2.
Which of the following statements is (are) true?
I.
An excited atom can return to its ground state by absorbing
electromagnetic radiation.
II.
The energy of an atom is increased when electromagnetic radiation is
emitted from it.
III.
The energy of electromagnetic radiation increases as its frequency
increases.
IV.
An electron in the n = 4 state in the hydrogen atom can go to the
n = 2 state by emitting electromagnetic radiation at the appropriate
frequency.
V.
The frequency and wavelength of electromagnetic radiation are inversely
proportional to each other.
A.
II, III, IV
B.
III, V
C.
I, II, III
D.
III, IV, V
E.
I, II, IV
3.
From the following list of observations, choose the one that most clearly supports the following conclusion:
a) emission spectrum of hydrogen
b) the photoelectric effect
c) scattering of alpha particles by metal foil
d) diffraction
e) cathode "rays"
Electrons have wave properties.
Answer:
4.
From the following list of observations, choose the one that most clearly supports the following conclusion:
a) emission spectrum of hydrogen
b) the photoelectric effect
c) scattering of alpha particles by metal foil
d) diffraction
e) cathode "rays"
Electromagnetic radiation has wave characteristics.
Answer:
5.
From the following list of observations, choose the one that most clearly supports the following conclusion:
a) emission spectrum of hydrogen
b) the photoelectric effect
c) scattering of alpha particles by metal foil
d) diffraction
e) cathode "rays"
The mass of the atom is located mainly in the nucleus.
Answer:
6.
From the following list of observations, choose the one that most clearly supports the following conclusion:
a) emission spectrum of hydrogen
b) the photoelectric effect
c) scattering of alpha particles by metal foil
d) diffraction
e) cathode "rays"
Atoms contain electrons.
Answer:
7.
From the following list of observations, choose the one that most clearly supports the following conclusion:
a) emission spectrum of hydrogen
b) the photoelectric effect
c) scattering of alpha particles by metal foil
d) diffraction
e) cathode "rays"
Electrons in atoms have quantized energies.
Answer:
8.
From the following list of observations, choose the one that most clearly supports the following conclusion:
a) emission spectrum of hydrogen
b) the photoelectric effect
c) scattering of alpha particles by metal foil
d) diffraction
e) cathode "rays"
de Broglie wavelengths.
Answer:
9.
In an investigation of the electronic absorption spectrum of a particular element, it is found that a photon having l = 500 nm provides just enough energy to promote an electron from the second quantum level to the third. From this information, we can deduce
A.
the energy of the n = 2 level.
B.
the energy of the n = 3 level.
C.
the sum of the energies of n = 2 and n = 3.
D.
the difference in energies between n = 2 and n = 3.
E.
all of these
10.
What is the wavelength of light that is emitted when an excited electron in the hydrogen atom falls from n=5 to n=2?
A.
5.12 × 10–7 m
B.
4.34 × 10–7 m
C.
6.50 × 10–7 m
D.
5.82 × 10–7 m
E.
none of these
11.
Which of the following is incorrectly paired?
A.
wavelength – l
B.
frequency – n
C.
speed of light – c
D.
hertz – s–1
E.
x-rays – shortest wavelength
12.
Consider the following portion of the energy-level diagram for hydrogen:
n = 4
–0.1361 ´ 10–18 J
n = 3
–0.2420 ´ 10–18 J
n = 2
–0.5445 ´ 10–18 J
n = 1
–2.178 ´ 10–18 J
For which of the following transitions does the light emitted have the longest wavelength?
A.
n = 4 to n = 3
B.
n = 4 to n = 2
C.
n = 4 to n = 1
D.
n = 3 to n = 2
E.
n = 2 to n = 1
13.
When a hydrogen electron makes a transition from n = 3 to n = 1, which of the following statements is true? I. Energy is emitted. II. Energy is absorbed. III. The electron loses energy. IV. The electron gains energy. V. The electron cannot make this transition.
A.
I, IV
B.
I, III
C.
II, III
D.
II, IV
E.
V
14.
Which of the following is a reasonable criticism of the Bohr model of the atom?
A.
It makes no attempt to explain why the negative electron does not eventually fall into the positive nucleus.
B.
It does not adequately predict the line spectrum of hydrogen.
C.
It does not adequately predict the ionization energy of the valence electron(s) for elements other than hydrogen.
D.
It does not adequately predict the ionization energy of the 1st energy level electrons for one-electron species for elements other than hydrogen.
E.
It shows the electrons to exist outside of the nucleus.
15.
In Bohr's atomic theory, when an electron moves from one energy level to another energy level more distant from the nucleus
A.
energy is emitted.
B.
energy is absorbed.
C.
no change in energy occurs.
D.
light is emitted.
E.
none of these
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