What is the frequency associated with radiation of 4.59 x
10-8 cm wavelength?
A. 6.54 x 10^17 s-1
B. 6.54 x 10^15 s-1
C. 1.53 x 10^8 s-1 D. 13.8 s-1
E. 2.18 x 10^7 s-1
Choose the INCORRECT statement concerning
electromagnetic radiation.
A. Infrared light has a longer wavelength than
ultraviolet light.
B. The greater the frequency of the electromagnetic
radiation, the greater the energy of the radiation.
C. A photon with a wavelength of 5000 Angstroms
has one-half as much energy as a photon with a
wavelength of 2500 Angstroms.
D. The speed of ultraviolet light rays is faster than
X-rays in a vacuum.
E. Electromagnetic radiation is energy transmission
in which electric and magnetic fields are
propagated as waves.
Experimental evidence for the existence of the
atomic nucleus comes from
A.
B.
C.
D.
Millikan’s oil drop experiment
atomic emission spectroscopy
the magnetic bending of cathode rays
alpha scattering by a thin metal foil
A radiation detector exposed to sunlight records the
energy falling on a given area each unit time. If such a
detector has a reading of 0.698 cal cm-2 min-1, how
many photons of sunlight are striking each cm2 in one
minute? Assume the average wavelength of sunlight is
460 nm.
(4.184 J = 1 calorie)
A.
B.
C.
D.
E.
1.62 x 1018 photons
4.32 x 1019 photons
6.76 x 1018 photons
2.31 x 1018 photons
9.63 x 1019 photons
C. increases
B. remains constant
D. none of these
The existence of discrete (quantized) energy levels in an
atom may be inferred from:
A.
B.
C.
D.
E.
diffraction of electrons by crystals
X-ray diffraction by crystals
atomic line spectra
experiments on the photoelectric effect
visible spectrum
The spectra of He is expected to be similar to that of
A. Li+
B. H
A. 0.147 pm
B. 0.044 pm
C. Na
D. He+
The photoelectric effect:
A. was discovered by Max Planck
B. describes the phenomenon of producing light by
shining a beam of electrons by on any metal
surface.
C. contradicted the view that light energy was
dependent upon intensity only
D. is not the same principle used in modern electric
eyes and solar calculators
E. results in a beam of electrons which increases in
number, but not velocity, as the wavelength of
incident light decreases
C. 0.351 pm
D. 0.031 pm
Zinc has work function of 4.33 eV. Determine the
following:
the cut-off wavelength for Zn:
A. 342 nm C. 118 nm
B. 287 nm D. 212 nm
when a laser beam of 120 nm-wavelength is incident to
the surface of zinc, what is the kinetic energy of the
electron released?
A. 1.1467 x 10^6 m/s
C. 8.657 x 10^6 m/s
B. 2.342 x 10^7 m/s
D. 2.923 x 10^7 m/s
The energy in kJ required per mole of beryllium ions
(Be3+) for its Paschen spectrum:
A. 3410
C. 670
B. 2333
D. 139
When an electron in an atom goes from a high energy
state to a low one, what occurs?
A. Another electron goes from a low energy state to
a high one.
B. The atom moves faster.
C. Light is given off.
D. This process is not possible.
E. Light is absorbed.
Calculate the wavelength in meters of light absorbed by
an electron in an atom of hydrogen as it moves from n =
3 to n = 6.
A. 1.09 x 10-6 m
C. 3.28 x 10-6 m
E. 1.65 x 10-11 m
As electron moves away from the nucleus, its potential
energy
A. decreases
A 30-MeV photon is scattered by an electron. If the
scattered photon comes off at 17°, what is its wavelength
after being scattered?
B. 8.22 x 10-7 m
D. 1.83 x 10-7 m
What is the wavelength of a bullet that is 0.450 g
traveling at 2000. m/s?
A. 2000. M
B. 2.94 × 10-24 m
C. 7.36 × 10-34 m D. 7.36 × 10-37 m
E. 1.49 × 10-40 m
Which statement regarding the wave function as
suggested by Erwin Schrodinger is INCORRECT?
A. It has fluctuating values of all points on the
curve.
B. It is a mathematical equation.
C. It is denoted by psi (Ψ)
D. It can describe any particle with wavelike
motions.
E. It corresponds to a standing wave within the
boundary of the system.
Which set of quantum numbers, l, m and s is not
acceptable for describing an electron?
A. 5, 4, 3, -½
B. 3, 3, -2, ½
C. 2, 1, -1, ½
D. 2, 0, 0, -½
Which set of quantum numbers is INCORRECT?
A. 3, 2, -1, +½
B. 1, 0, 0, ½
C. 4, 1, +2, -½
D. 2, 0, 0, -½
The possible values of the orbital angular momentum
quantum number of a 3p electron are:
A. +1/2, -1/2
C. -1
E. 1
B. -1, 0, +1
D. 0
An orbital:
I) describes a region of high electron density.
II) describes a region in an atom where an electron is
likely to be found.
III) is a wave function resulting from specific values
assigned to quantum numbers in wave equations.
IV) describes a spherical region around a nucleus
where an electron can be found.
A. II only
B. I and II
C. II and III
D. I, II, and III
E. I, II, III, and IV
What is the orbital designation for the quantum
numbers n = 2, ℓ = 1?
A. 3s
C. 2d
E. 3p
B. 2s
D. 2p
What is the de Broglie wavelength (in nm) of a
molecule of buckminsterfullerene (C-60), moving at a
speed of 100.0 m/s?
A. 5.537 pm
B. 6.785 pm
C. 3.456 pm
D. 4.119 pm
Which of the following statements concerning quantum
numbers is NOT correct?
A. "n" relates the most probable distance from the
nucleus.
B. "l" denotes geometric shape.
C. "m" denotes orientation of an orbital with
respect to the others.
D. The fourth quantum number refers to electron
spin.
E. The four quantum numbers are derived from
wave mechanics.
In a hydrogen atom, orbitals with the same energy:
I) extend the same distance from the nucleus.
II) have the same principal quantum number, n.
III) are referred to as iso-electronic.
IV) are referred to as degenerate.
V) are represented by 1s and 2s orbitals.
A. I, III, IV
B. I, II, IV
C. I, IV, V
D. I, II, III
E. I, II, III, and IV
Which of the following statements about orbital shapes
is NOT true?
A. A 1s orbital is spherical.
B. 2p orbitals have a node at r = 0.
C. There are only two 2p orbitals, each directed
along and x or y axis.
D. There are 5 3d orbitals.
E. Four of the 3d orbitals are alike except for the
orientation with respect to the axes.
The quantum numbers of the last electron of arsenic
could be:
A. n = 4, ℓ = 2, mℓ = 1, ms = ½
B. n = 4, ℓ = 1, mℓ = 1, ms = ½
C. n = 3, ℓ = 1, mℓ = 1, ms = ½
D. n = 4, ℓ = 3, mℓ = 1, ms = ½
E. n = 4, ℓ = 1, mℓ = ½, ms = 0
A sample of helium is stored in a 1nm, one-dimensional
box, calculate the value of the quantum number's energy
level at 25degC
A. 4
B. 27
C. 36
D. 1240
The ground state electron configuration of phosphorus
is.
A. 1s2 2s2 2p4 3p6 3d1
B. [Ar] 3s2 3p3
C. 1s2 2s2 2p6 3s2 3p3
D. 1s2 2s2 2p6 3s4 3p1
E. 1s2 2s2 2p6 3s2 2d3