Welcome to the Quiz!
This quiz contains 13 questions from a mix of 1 subtopics.
Which of the following best describes how electrons are arranged around the nucleus of an atom?
in clouds
in continuous orbits
in discrete energy levels
|
What happens when an electron transitions from a higher energy level to a lower energy level?
a photon is absorbed
the electron gains kinetic energy
a photon is emitted
the electron loses kinetic energy
|
How is the energy of a photon related to an electronic transition in an atom?
it is equal to the kinetic energy gained by the electron
it is equal to the difference in energy between the two levels
it is inversely proportional to the wavelength of the transition
it is proportional to the frequency of the transition
|
If an electron transitions from n=2 to n=1, what happens to the electron's energy?
it becomes zero
it increases
it stays the same
it decreases
|
What is the process called when an electron gains enough energy to completely escape the pull of the nucleus?
excitation
ionisation
emission
transition
|
Where in the electromagnetic spectrum are the photons emitted when excited mercury electrons fall back to lower energy levels?
X-rays
ultraviolet
radio waves
microwaves
|
What happens after the fluorescent coating absorbs UV photons from the mercury vapour?
electrons become excited to higher energy levels
heat is generated
the coating becomes charged
electrons fall to lower energy levels and emit photons
|
What causes the tube to emit visible light?
UV photons from the mercury vapour
excited electrons in the fluorescent coating falling to lower levels
excited mercury electrons falling to lower levels
accelerated electrons hitting mercury atoms
|
How does the energy of a photon emitted from the fluorescent coating compare to one absorbed from the mercury vapour?
it has higher energy
it has the same energy
it has lower energy
it depends on the transitions
|
Briefly explain the key process that causes a fluorescent light tube to emit visible light.
|
An electron in an atom transitions from energy level n=2 to the ground state, n=1, emitting a photon of energy 10.2 eV. Calculate the frequency of the emitted photon.
1.55 x 1014 Hz
2.46 x 1015 Hz
4.84 x 1014 Hz
3.28 x 1015 Hz
|
If an electron absorbs a photon with an energy of 3.4 eV to move to a higher energy level, what is the frequency of this photon?
4.84 x 1014 Hz
8.21 x 1014 Hz
5.12 x 1014 Hz
3.25 x 1015 Hz
|
Calculate the energy difference in eV when an electron moves from energy level n=3 to n=2, knowing that the energy emitted is equivalent to a photon with a frequency of 4.57 x 1014 Hz.
1.5 eV
3.0 eV
1.9 eV
2.4 eV
|