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Electron Volt and Energy Levels Quiz

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Questions and Answers

What is the minimum energy required for electrons to be emitted from the surface of a metal?

Work function (correct)
Threshold frequency
Stopping potential
Energy level

In the photon model of light, what are the discrete packets in which EM waves travel called?

Positrons
Neutrons
Photons (correct)
Protons

What is the potential difference needed to stop photoelectrons with the maximum kinetic energy?

Discrete energy level
Work function
Threshold frequency
Stopping potential (correct)

Which equation shows the relationship between the work function, maximum kinetic energy, and the frequency of light?

$E = Φ + E k (max)$ (C) Signup and view all the answers

What do electrons in atoms exist in according to the text?

Discrete energy levels (A) Signup and view all the answers

What quantity is directly proportional to frequency in the photon model of light?

$hf$ (B) Signup and view all the answers

What is the relationship between energy and electron volts (eV)?

Energy is directly proportional to eV, with 1 eV = 1.6 × 10^-19 J (B) Signup and view all the answers

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 (A) Signup and view all the answers

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 (D) Signup and view all the answers

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 (B) Signup and view all the answers

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 (C) Signup and view all the answers

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 (A) Signup and view all the answers

In the process of excitation, what happens to an electron in an atom?

It gains energy and moves to a higher energy level. (C) Signup and view all the answers

Which of the following statements about ionization is correct?

Ionization occurs when an electron gains enough energy to be removed from the atom entirely. (B) Signup and view all the answers

What is the primary purpose of the fluorescent coating inside a fluorescent tube?

To absorb UV photons and re-emit visible light. (C) Signup and view all the answers

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. (C) Signup and view all the answers

In a fluorescent tube, what is the primary function of the high voltage applied across the tube?

To accelerate free electrons through the tube. (C) Signup and view all the answers

When an excited electron in a mercury atom returns to its ground state, what type of electromagnetic radiation is emitted?

Ultraviolet (UV) radiation (B) Signup and view all the answers

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