# Chapter 6 Wave Energy

## 29 terms

### Mechanical Waves

water waves, sound waves and the waves that travel along a spring or rope are mechanical waves. Newton's laws govern the motion of mechanical waves

Yes

### Transverse mechanical waves...

causes particles of a material to move perpendicular to the direction the wave is moving

### Longitudinal mechanical waves...

causes particles of a material to move back and forth in the same direction the wave is moving

### What are sound waves?

Sound originates from the vibration of sound producers

longitudinal

### What things produce sound waves?

Strings of violins or pianos, or human vocal chords

### What is noise?

Irregular vibrations

### What is music?

sustained notes - repeated vibrations

~330 m/s

~1440 m/s

~5000 m/s

Ex: d=v*t

the pitch

20Hz-20,000Hz

### What is amplitude?

The volume of a sound wave

### Electromagnetic waves

light waves, radio waves, and xrays are examples of electromagnetic waves

No

3x10^8 m/s

### How fast do electromagnetic waves travel?

perpendicular to one another and at the speed of light 3x10^8 m/s

### How are electromagnetic waves produced?

by moving electromagnetic fields

### What do mechanical and electromagnetic waves have in common?

Crests, troughs, wavelength, and frequency

### What is a crest?

the highest point in a wave

### What is a trough?

the lowest point in a wave

### What is amplitude?

the volume of a wave

### What is a wavelength?

the distance measured between two points in a wave

### What is the formula to find velocity of electromagnetic waves?

velocity=wavelength*frequency=light speed

### Is the velocity of an electromagnetic wave in a vacuum equal to the speed of light?

Yes, regardless of wavelength or frequency

### What happens when an electromagnetic wave hits matter?

There will either be transmission, absorption, or scattering