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In which of the following situations will an individual's purchasing power be unaffected?
Radio Waves
Electromagnetic waves with wavelengths longer than infrared light, used for communication over long distances, such as in radio and television broadcasting.
Internal Body Structures
The organs and tissues within the body that perform essential functions for life.
X-rays
A form of electromagnetic radiation used in medical imaging to create pictures of the inside of the body, especially bones.
Ultrasound
A diagnostic imaging technique using high-frequency sound waves to create images of the inside of the body.
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