Question

why do waves move faster at higher temperatures and in a solid phase?
○ there is more energy and the particles are farther apart.
○ there is less energy and the particles are closer together.
○ there is less energy and the particles are farther apart.
○ there is more energy and the particles are closer together.

Explanation:

To determine the correct answer, we analyze the relationship between temperature, phase, and wave speed:

1. Temperature and Energy: Higher temperatures mean particles have more kinetic energy (more energy overall). This increased energy allows particles to transfer wave energy more quickly.
2. Phase and Particle Spacing: In the solid phase, particles are closely packed (closer together) compared to liquids or gases. Closer particles facilitate faster wave propagation as interactions between particles are more immediate.

Now let's evaluate each option:

• Option 1: "Particles are farther apart" is incorrect for solids (solids have closely packed particles). Eliminate.
• Option 2: "Less energy" contradicts higher temperatures (higher temp = more energy). Eliminate.
• Option 3: "Less energy" (wrong for high temp) and "particles farther apart" (wrong for solids). Eliminate.
• Option 4: "More energy" (matches high temp) and "particles closer together" (matches solid phase). This explains faster wave movement.

Answer:

D. There is more energy and the particles are closer together.