The rare earth elements include A. the alkali metals and the transition metals. B. the actinide series and the alkaline earth metals. C. the lanthanide series and the actinide series. D. the lanthanide series and the alkali metals.

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The rare earth elements include A. the alkali metals and the transition metals. B. the actinide series and the alkaline earth metals. C. the lanthanide series and the actinide series. D. the lanthanide series and the alkali metals.

The rare earth elements include the lanthanide series and the actinide series.

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Asked 1/15/2019 1:41:40 PM

Updated 1/15/2019 2:44:27 PM

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If the amplitude of the resultant wave is twice as great as the amplitude of either component wave, and this wave exhibits reinforcement, the component waves must A. be in phase with each other. B. be traveling in the opposite direction of the resultant wave. C. have a different wavelength than the resultant wave. D. have a different frequency than the resultant wave.

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If the amplitude of the resultant wave is twice as great as the amplitude of either component wave, and this wave exhibits reinforcement, the component waves must be in phase with each other.

Added 1/1/2021 9:19:32 PM

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In which of the following cases would sound reach each ear out of phase? A. You are standing directly to the right of the sound source. B. You are standing directly behind the sound source. C. You are standing directly below the sound source. D. You are standing directly in front of the sound source.

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Updated 10/15/2020 12:29:28 PM

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