Multiple choice

A subwoofer is a loudspeaker designed to reproduce extremely low audio frequencies.The barium compound used in subwoofer magnets to provide power is

  1. barium azide

  2. barium bromide

  3. barium chloride

  4. barium ferrite
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Barium ferrite, BaFe2O4 and related ferrite materials are components of magnetic stripe cards.The Fe3+ centers, with a high-spin d5 configuration, are ferromagnetically coupled. This area of technology is usually considered to be an application of the related fields of materials science and solid state chemistry. It is also used in subwoofer magnets to provide power.

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