which example would contain only longitudinal waves?\n a crowd doing the wave at a sporting event\n an…

which example would contain only longitudinal waves?\n a crowd doing the wave at a sporting event\n an ultrasound that transmits soundwaves\n the waves formed by the ocean\n playing the guitar strings

which example would contain only longitudinal waves?\n a crowd doing the wave at a sporting event\n an ultrasound that transmits soundwaves\n the waves formed by the ocean\n playing the guitar strings

Answer

Explanation:

Step1: Recall the definition of longitudinal waves

Longitudinal waves are waves in which the displacement of the medium is in the same direction as the direction of the wave propagation.

Step2: Analyze each option

  • Option 1: a crowd doing the wave at a sporting event This is a transverse - like wave (the motion of people is perpendicular to the direction of the wave propagation in a sense, it's more of a mechanical wave with a transverse - like behavior in the context of the crowd's motion).
  • Option 2: an ultrasound that transmits soundwaves Sound waves are longitudinal waves. Ultrasound is a type of sound wave (high - frequency sound). In sound waves, the particles of the medium (e.g., air, tissue in the body for ultrasound) vibrate parallel to the direction of wave propagation.
  • Option 3: the waves formed by the ocean Ocean waves are a combination of transverse and longitudinal motions. The overall motion of the wave has a significant transverse component (the up - and - down motion of the water surface relative to the direction of wave travel).
  • Option 4: playing the guitar strings Guitar string vibrations produce transverse waves on the string (the string moves perpendicular to its length as it vibrates), and these vibrations then produce sound waves (longitudinal) in the air. But the question is about the example with only longitudinal waves.

Answer:

an ultrasound that transmits soundwaves