Sound Requires a ________ Through Which to Travel

question 29

Multiple Choice

Sound requires a ________ through which to travel.

• A) medium
• B) pressure
• C) vacuum
• D) wave

---

Definitions:

Freud

Sigmund Freud, an Austrian neurologist and the founder of psychoanalysis, a clinical method for treating psychopathology through dialogue between a patient and a psychoanalyst.

Mead

George Herbert Mead, an American philosopher, sociologist, and psychologist, known for his contributions to social psychology and the development of symbolic interactionism.

Piaget

A Swiss developmental psychologist and philosopher known for his theories of cognitive development in children.

Virtual Community

An association of people, scattered across the country, continent, or planet, who communicate via computer and modem about a subject of common interest.