Researchers at Duke University have developed 3-D printed metamaterials that can control sound waves with high efficiency. These materials manipulate sound not through their plastic properties but through their unique shapes and the space around them. The metamaterials resonate at different frequencies, affecting sound wave speed and direction. This technology could enhance applications like sonar by controlling sound waves in water.

What is the primary factor that allows the metamaterials to control sound waves?

• The type of plastic used

• The shape of the metamaterial

• The temperature of the environment

• The color of the material

How does the resonance of each column in the metamaterial structure affect sound waves?

• It decreases the frequency of the sound

• It increases the volume of the sound

• It alters the speed and direction of the sound waves

• It changes the color of the sound

What analogy is used to explain the resonance of the metamaterial columns?

• A tuning fork

• A glass bottle with varying liquid levels

• A vibrating string

• A drum being hit

What is one potential application of these metamaterials in water?

• Enhancing underwater photography

• Reducing water pollution

• Improving sonar technology

• Increasing water temperature

What is the ultimate goal of the researchers in terms of sound wave manipulation?

• To eliminate all sound reflections

• To create louder sound systems

• To improve sound wave control in various environments

• To develop new musical instruments