ARDMS Ultrasound Physics & Instrumentation Practice Exam

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What type of wave is sound classified as?

  1. Electrical and transverse wave

  2. Mechanical and longitudinal wave

  3. Electromagnetic and longitudinal wave

  4. Mechanical and transverse wave

The correct answer is: Mechanical and longitudinal wave

Sound is classified as a mechanical and longitudinal wave. This classification stems from the nature of sound propagation. Being a mechanical wave means that sound requires a medium (like air, water, or solid materials) to travel through; it cannot propagate in a vacuum. Sound interacts with molecules in the medium, transferring energy and causing them to vibrate. The term longitudinal wave describes the manner in which sound waves move through a medium. In a longitudinal wave, the particles of the medium oscillate back and forth in the same direction as the wave travels. This motion creates compressions and rarefactions as the wave moves, which is typical for sound waves. Thus, understanding sound as a mechanical and longitudinal wave provides insight into its physical characteristics, behaviors during transmission, and interaction with various materials.

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