Question

mechanical waves
another type of mechanical wave is known as a longitudinal wave (sometimes called a compressional wave). if youve ever played with a slinky, you have seen a compressional wave in action. in a compressional wave, the energy moves through the wave (the same as with a transverse wave), but the matter inside the medium moves side to side, like a vibration. we say that the matter moves parallel to the energy that moves through the wave.
look at the picture below. when sound moves through the air, the energy moves from the sound source to the observer. as the energy moves, the air molecules individually vibrate back and forth.
another type of longitudinal (compressional) wave includes seismic waves (created by an earthquake or explosion).
define it!
what is a longitudinal wave?
write it!
how do the particles in a longitudinal wave move?
explain it!
how does the energy in a longitudinal wave move?
draw it!
sketch a longitudinal wave in the space below.

Explanation:

• Define It!: A longitudinal wave (compressional wave) is a type of mechanical wave where matter inside the medium moves parallel to the energy that moves through the wave.
• Write It!: The particles in a longitudinal wave move back and forth (vibrate) parallel to the direction of energy propagation.
• Explain It!: The energy in a longitudinal wave moves from the source (e.g., sound source) to the observer through the vibration and transfer of energy between particles in the medium (e.g., air molecules vibrating back and forth transfer sound energy).
• Draw It!: Sketch should show lines (representing the medium, e.g., air) with arrows indicating back - and - forth particle motion (parallel to the direction of energy flow, which can be represented by an arrow from the source to the observer).

Answer:

• Define It!: A longitudinal wave (compressional wave) is a mechanical wave where matter in the medium moves parallel to the wave's energy flow.
• Write It!: Particles in a longitudinal wave move back and forth parallel to the energy propagation direction.
• Explain It!: Energy in a longitudinal wave moves from the source to the observer via particle - to - particle vibration in the medium.
• Draw It!: (Sketch with parallel particle motion arrows and an energy - direction arrow from source to observer).