PHYS 1010 Exam 3 Questions with
complete solution 2026/2027
The spectral lines for elements are called atomic fingerprints because they: - correct answer ✔are
unique for each element
In the Rutherford model of the atom, nearly all of the volume occupied by the atom consists of: - correct
answer ✔a vacuum
What force is responsible for holding the electrons in their orbits around the nucleus? - correct answer
✔electric
As the temperature of an incandescent radiating object increases, the frequency with the maximum
brightness: - correct answer ✔increases
Planck was able to obtain the correct curve for the spectrum of light emitted by a hot object by
assuming that the: - correct answer ✔vibrational energies of the atomic resonators were quantized
What is the energy of a photon associated with light having a 500nm wavelength? - correct answer
✔2.48 eV
Einstein was able to account for the experimental observations of the photoelectric effect by assuming
that: - correct answer ✔light consists of photons
Light quanta (photons) with an energy of 5.0 eV are incident on a metal surface. The photoelectrons that
are ejected from the surface have a kinetic energy of 3.0 eV. What is the work function of the metal? -
correct answer ✔2.0 eV
, Bohr gave the following reason for the electron in the hydrogen atom existing only in certain discrete
energy levels - correct answer ✔He gave no explanation, but simply postulated it
When a light is emitted by an atom: - correct answer ✔an electron drops to a lower energy level
In making a transition from the n=1 quantum state to the n=2 quantum state, the hydrogen atom must:
- correct answer ✔absorb a photon
What is the magnitude of the energy difference between the n=2 quantum state and the n=1 quantum
state of a hydrogen atom? - correct answer ✔10.2 eV
The abbreviation eV stands for electron Volt which is an atomic physics unit of: - correct answer
✔energy
The work function of a metal is: - correct answer ✔the work required to remove an electron from the
surface
The spikes in the X-Ray spectrum are due to: - correct answer ✔photons emitted by electrons
changing inner shell orbits
What difference in energy between two atomic levels of an atom is required to produce an X-ray photon
with a frequency of 6.0x10^17 Hz? - correct answer ✔2.48 KeV
A mass vibrates up and down on a vertical spring. If the period of the motion is two second, the
frequency is: - correct answer ✔one-half cycle per second
A wave in which the individual particles of a medium vibrate back and forth perpendicular to the
direction that the wave travels is called a: - correct answer ✔transverse wave
complete solution 2026/2027
The spectral lines for elements are called atomic fingerprints because they: - correct answer ✔are
unique for each element
In the Rutherford model of the atom, nearly all of the volume occupied by the atom consists of: - correct
answer ✔a vacuum
What force is responsible for holding the electrons in their orbits around the nucleus? - correct answer
✔electric
As the temperature of an incandescent radiating object increases, the frequency with the maximum
brightness: - correct answer ✔increases
Planck was able to obtain the correct curve for the spectrum of light emitted by a hot object by
assuming that the: - correct answer ✔vibrational energies of the atomic resonators were quantized
What is the energy of a photon associated with light having a 500nm wavelength? - correct answer
✔2.48 eV
Einstein was able to account for the experimental observations of the photoelectric effect by assuming
that: - correct answer ✔light consists of photons
Light quanta (photons) with an energy of 5.0 eV are incident on a metal surface. The photoelectrons that
are ejected from the surface have a kinetic energy of 3.0 eV. What is the work function of the metal? -
correct answer ✔2.0 eV
, Bohr gave the following reason for the electron in the hydrogen atom existing only in certain discrete
energy levels - correct answer ✔He gave no explanation, but simply postulated it
When a light is emitted by an atom: - correct answer ✔an electron drops to a lower energy level
In making a transition from the n=1 quantum state to the n=2 quantum state, the hydrogen atom must:
- correct answer ✔absorb a photon
What is the magnitude of the energy difference between the n=2 quantum state and the n=1 quantum
state of a hydrogen atom? - correct answer ✔10.2 eV
The abbreviation eV stands for electron Volt which is an atomic physics unit of: - correct answer
✔energy
The work function of a metal is: - correct answer ✔the work required to remove an electron from the
surface
The spikes in the X-Ray spectrum are due to: - correct answer ✔photons emitted by electrons
changing inner shell orbits
What difference in energy between two atomic levels of an atom is required to produce an X-ray photon
with a frequency of 6.0x10^17 Hz? - correct answer ✔2.48 KeV
A mass vibrates up and down on a vertical spring. If the period of the motion is two second, the
frequency is: - correct answer ✔one-half cycle per second
A wave in which the individual particles of a medium vibrate back and forth perpendicular to the
direction that the wave travels is called a: - correct answer ✔transverse wave
