# Physics Waves

### 23 terms by Jburch

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### Wave

A disturbance that carries energy through matter or space without the transport of matter.

### Mechanical Wave

Needs a medium to travel through. Energy is needed to create a disturbance in the elastic medium. Used in models for waves you cannot see. EX) water waves, sound, rope wave.

### Medium

A material that a wave travels through like water or air.

### Wave Pulse

A single disturbance that travels through a medium.

### Periodic Wave

When a wave moves up and down at the same rate.

### Transverse Wave

The displacement of particles in the medium is perpendicular to the direction of wave motion.

### Longitudinal Wave

The displacement of particles of the medium is parallel to the direction of wave motion. EX) sound

### Surface Wave

Have properties of both transverse and longitudinal waves. EX) ocean wave.

### Electromagnetic Waves

Don't need a medium. Travel through vacuums at the speed of light. EX) light, x-ray, radio.

### Wave Velocity

The speed of a wave. Distance/time.

### Amplitude

The maximum displacement of a particle of the medium from the equilibrium point. Does not depend on speed.

### Wavelength

The shortest distance between two points on a wave that are "in phase." Consists of troughs and crests. Equal to velocity/frequency.

### Period

The shortest time interval during which the motion of a wave repeats itself. Does not depend on the speed or medium, but only the wave source. Indicated by the letter T.

### Frequency

The number of waves per unit of time. Equal to 1/period. Does not depend on speed or medium, only the source of the wave.

### What does the speed of a mechanical wave depend upon?

Properties of medium, not amplitude or frequency.

### Incident Wave

A wave that strikes a boundary between two mediums.

### Reflected Wave

A returning wave that results from the nervy from an incident wave being reflected back.

### Superposition

If 2 waves exist in the same phase in a medium at the same time, they affect the medium independently. The displacement of the medium is the sum of the individual displacements.

### Interference

The result of the superposition of two or more waves.

### Destructive Interference

When two pulses from equal but opposite amplitudes meet.

### Node

A point in interference where the displacement of a medium is zero.

### Antinode

Point of largest displacement in interference.

### Standing Wave

The result of 2 or more waves of the same wavelength, frequency, and amplitude traveling in opposite directions through the same medium.

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