18 Questions
What is the minimum energy required for electrons to be emitted from the surface of a metal?
Work function
In the photon model of light, what are the discrete packets in which EM waves travel called?
Photons
What is the potential difference needed to stop photoelectrons with the maximum kinetic energy?
Stopping potential
Which equation shows the relationship between the work function, maximum kinetic energy, and the frequency of light?
$E = Φ + E k (max)$
What do electrons in atoms exist in according to the text?
Discrete energy levels
What quantity is directly proportional to frequency in the photon model of light?
$hf$
What is the relationship between energy and electron volts (eV)?
Energy is directly proportional to eV, with 1 eV = 1.6 × 10^-19 J
How does a diffraction grating or prism reveal information about the energy levels of atoms?
It produces a line spectrum, showing only the discrete photon energies emitted by the atoms
What is the difference between a line emission spectrum and a line absorption spectrum?
A line emission spectrum shows the wavelengths of light emitted by excited atoms, while a line absorption spectrum shows the wavelengths of light absorbed by cooled atoms
What is the significance of the discrete energy levels in atoms, as revealed by line spectra?
It shows that electrons in atoms can only transition between specific, allowed energy levels
How do the energy levels in atoms relate to the emission and absorption of photons?
Electrons can only transition between specific, allowed energy levels, and the emitted or absorbed photons have specific, corresponding energies
What is the purpose of a fluorescent tube in revealing information about atomic energy levels?
The fluorescent tube produces a line emission spectrum, which can be used to identify the energy levels in atoms
In the process of excitation, what happens to an electron in an atom?
It gains energy and moves to a higher energy level.
Which of the following statements about ionization is correct?
Ionization occurs when an electron gains enough energy to be removed from the atom entirely.
What is the primary purpose of the fluorescent coating inside a fluorescent tube?
To absorb UV photons and re-emit visible light.
Why is the unit electron volt (eV) used instead of joules (J) when describing energy differences between energy levels?
Because the energy differences involved are very small, so eV is a more appropriate unit.
In a fluorescent tube, what is the primary function of the high voltage applied across the tube?
To accelerate free electrons through the tube.
When an excited electron in a mercury atom returns to its ground state, what type of electromagnetic radiation is emitted?
Ultraviolet (UV) radiation
Test your knowledge on electron volts, energy conversion, and energy levels related to photon emission. Learn how to convert between electron volts and joules. Understand how line spectra are produced through diffraction gratings or prisms.
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