Properties of Light Review

In a hydrogen atom, when an electron jumps from an excited energy state to a more stable energy state,

• electromagnetic radiation is emitted by the atom

• electromagnetic radiation is absorbed by the atom

• the atom becomes a positively charged ion

• the atoms becomes a negatively charged ion

• the atom undergoes nuclear decay

Which of the following colors of visible light has the shortest wavelength?

• Orange

• Blue

• Red

• Green

• Yellow

1. If an AM radio station broadcasts at 995,000 Hz, what is the wavelength of this radiation?

• 6.59x10^-28m

• 1.01x10^-6m

• 301 m

• 3.32x10^-3m

Excited hydrogen atoms emit light in the ultraviolet at 2.47x10¹⁵Hz. What is the energy of a single photon with this frequency?

• 8.04x10^-41J

• 2.68x10^-19J

• 1.64x10^-18J

• 6.11x10^-17J

• 1.21x10^-7J

1. The ___ of a photon of light is ___ proportional to its frequency and ___ proportional to its wavelength.

• Amplitude, directly, inversely

• Energy, inversely, directly

• Energy, directly, inversely

• None of these

Which of the following statements is incorrect:

• The location and energy of an electron in an atom can be simultaneously known with little or no uncertainty

• The energies of an atom’s electrons are quantized

• Quantum numbers define the energy states and orbitals available to an electron

• Electrons have both wave and particle properties

The Schrödinger wave equation:

• Calculates the position and momentum of an electron at any given time

• Can be solved to determine the probability of finding an electron in a region of space

• Proves that energy is equal to the mass times the speed of light squared

• Incorrectly predicts circular orbits of electrons around nuclei

1. Which of the following types of experiments demonstrates that an electron has the properties of a particle?

• Nuclear fission

• Electron diffraction

• Light emission from atomic gases

• Mass spectroscopy

• Photoelectric effect

For which of the following transitions does the light emitted have the longest wavelength?

• n = 5 to n= 4

• n = 4 to n = 1

• n = 4 to n = 2

• n = 3 to n = 1

• n = 5 to n = 2

1. What instrument is used to measure the emission spectra of different gaseous elements?

• Mass spectrometer

• Atomic absorption

• Gas chromatograph

• Spectroscope