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CK-12 Foundation
Ck 12: Physical Science: Doppler Effect
[Free Registration/Login may be required to access all resource tools.] Discusses what the Doppler Effect is and how it occurs.
Georgia Department of Education
Ga Virtual Learning: Physical Science: Waves and Sound
In this module, students investigate the properties and behavior of different types of waves.
CK-12 Foundation
Ck 12: Earth Science: Expansion of the Universe
[Free Registration/Login may be required to access all resource tools.] Recognize how redshift suggests the universe is expanding.
CK-12 Foundation
Ck 12: Physical Science: Wave Frequency
[Free Registration/Login may be required to access all resource tools.] Definition of wave frequency and how it is related to the energy of a wave.