| A | B |
|---|
| reverberation | repeated echoes caused when the reflected sound comes back just a bit after the original sound (usually occurs in a large room or auditorium) |
| Reflection | when waves bounce off of a surface |
| Compression | where particles are pressed together as the sound waves move through matter |
| Refraction | the change in direction of a wave when it changes speed as it travels from one material to another |
| Rarefaction | where particles are spread apart as the sound waves move through matter |
| luminous | term that describes an object that produces light |
| Visible light | the only part of the electromagnetic spectrum we can see |
| Transverse | a wave in which units of the medium move in a direction perpendicular to the direction that the wave moves |
| Diffraction | bending of waves around an object |
| 120 | the highest decibel that humans can hear at before it hurts our ears |
| Surface | earthquake wave that is last to arrive and causes the most damage |
| Primary | earthquake wave that travels as a longitudinal wave as it pushes and pulls forward and backward and is the first to arrive |
| Larynx | sits at the top of the windpipe, or trachea and helps produce vocal sounds |
| Pinna / outer ear | part of the ear that collects sound waves and sends them into the ear canal |
| Electromagnetic | vibrating electrons are partly electric and partly magnetic (radiant energy is transmitted by this type of wave) |
| Echoes | reflected sound waves |
| Longitudinal | waves where the disturbance moves in the same direction (parallel) as the wave, such as sound waves |
| Eardrum | part of the middle ear that vibrates when sound waves strike it |
| Cochlea | a snail shaped chamber in the inner ear filled with liquid and lined with cells that have tiny hairs on top that react to the waves making up the start of the auditory nerve |
| Pupil | the black hole in the center of the eye where light enters |
| Cornea | the transparent coating which covers the iris and pupil at the front of the eye |
| Lens | part of the eye that focuses light on the retina |
| Retina | part of the eye that contains millions of sensors that convert light into electric impulses which are sent to the optic nerve of the brain |
