CPC Unit 3 Study Guide

A gamma ray has a frequency of 2.88 × 10²¹ Hz. What does this mean?

• 2.88 × 10²¹ gamma waves pass a point every second

• 2.88 × 10²¹ Joules of energy are in gamma waves

• gamma waves are 2.88 × 10²¹ micrometers tall

• gamma waves are 2.88 × 10²¹ micrometers long

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Which of the following electromagnetic waves has photons of the highest energy?

• ultraviolet

• infrared

• x-rays

• microwaves

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If a radio station were to increase its frequency from 94.5 MHz to 99.1 MHz, what would happen to the station's wavelength?

• The wavelength would go down.

• The wavelength would double.

• The wavelength would go up.

• The wavelength would not change.

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What kind of electromagnetic radiation has a frequency of 5.00 × 10¹⁰ Hz?

• Infrared radiation

• Microwave radiation

• Ultraviolet radiation

• Visible light

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Which phenomena can be explained only by the particle model of light?

• Photoelectric effect

• Diffraction

• Interference

• Refraction

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Planck’s quantum concept relates to energy lost or gained by matter. Which of the following best describes this concept?

• Energy is continuous and can be gained or lost in any amount, even a fraction of quanta.

• Energy is quantized and can only be gained or lost in discrete units called quanta.

• Energy is only lost in units called quanta, but is never gained by matter.

• Energy is only gained in units called quanta, but is never lost by matter.

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Mercury’s atomic emission spectrum is shown below. Estimate the wavelength of the orange line.

• Wavelength: 600 cm

• Wavelength: 615 nm

• Wavelength: 620 cm

• Wavelength: 630 nm

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The Heisenberg uncertainty principle states that ___________.

• electrons of atoms in their ground states enter energetically equivalent sets of orbitals singly before they pair up in any orbital of the set

• two atoms of the same element must have the same number of protons

• it is impossible to simultaneously know the precise position and velocity of a particle

• no two electrons in the same atom can have the same set of four quantum numbers

What is the primary difference between the 1s and the 2s orbitals?

• shape

• number of electrons

• number of neutrons

• size

According to Bohr’s atomic model, why do atomic emission spectra contain only certain frequencies of light?

• Because electrons can only occupy specific energy levels.

• Because light is emitted continuously across all frequencies.

• Because atoms can emit light at any frequency.

• Because electrons do not change energy levels.

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