[Solved] Which of these is not a reflection of the changes brought by the 1920s' "sexual revolution"? A) New dances and greater erotic freedom. B) A shift from formal courting to the new custom of casual dating. C) Young people experimenting sexually without contemplating marriage. D) A surge in pornographic lyrics in popular music. E) Female sexuality becoming more openly acknowledged. Wavelength: The distance between successive crests of a wave, often used to describe the properties of light and sound waves. Purity: Refers to the state of being free from contaminants or pollutants. Wave Amplitude: The height of a wave from its mean or rest position to its peak, reflecting the energy or intensity of the wave. Sound: Waves that propagate through the air or another carrier and can be detected by the ears of people or animals.