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Chapter 4
| Question | Answer |
|---|---|
| All sounds that people hear travel to the ears as_____ | sound waves |
| Sound wave travel through all kinds of ______- solids, liquids and gasses | matter |
| Objects that are_____ produce sound waves | vibrating |
| As the object moves outward, it pushes air molecules closer together, producing a_____ | compression |
| As the object moves inward, it pulls air molecules farther apart, producing a_____ | rarefaction |
| A ____ is a series of rarefactions and compressions | wave |
| Matter vibrates back and forth in the same direction as the sound waves travel; so sound waves are classified as_____ waves | longitudinal |
| The distance between a point on a wave and the nearest point just like it is called the _____ | wavelength |
| The number of wavelengths that pass a given point in one second is a sound wave's ____; its SI unit is ______ | frequency, hertz |
| A sound wave with a _____ frequency is produced by an object that vibrate quickly | high |
| The____ of sound waves depends on the kind of material the waves are traveling through | speed |
| Sound waves generally travel fastest through_____ and slowest through _____ | solids, gasses |
| Sound waves generally travel faster through____ air and slower through____ air | warm, cold |
| How high or low people perceive a sound to be is the_____ of the sound | pitch |
| Sounds with a low frequency have a ____ pitch | low |
| When you speak, you use our___ ____ to make sounds | vocal cords |
| How loud or soft people perceive a sound to be is related to the_____ of the sound | energy |
| The _____ of a sound wave indicates how much energy the sound has | amplitude |
| The loudness of a sound can be measured in_____ | decibels |
| A sound that is reflected is an_______ | echo |
| ______ systems use reflected sound to calculate distance. The distance of an object can be calculated from the time difference between when_____ leave the system and when they returns to the system | Sonar, waves |
| Bats use______ to hunt and to help them navigate | echolocation |
| Ultrasound scanners convert________ sound waves into images f internal body parts | high- frequency |
| Light is a type of wave called an_______ wave | electromagnetic |
| Light waves can travel through____, but they travel fastest when they move through a _____ | matter, vacuum |
| Light waves travel much ____ than sound waves | faster |
| You perceive different wavelengths of light as different____ | colors |
| Reflection occurs when light waves____ off the surface of a material | reflect |
| In____, most light waves travel through an object | transmission |
| When____ occurs, light energy is converted into other forms of energy | absorption |
| A material is____ if it allows almost all light that strikes it to pass through and forms a clear image | transparent |
| A material is ____ if it allows most of the light that strikes it to pass through but forms a blurry image | translucent |
| A material is____ if light does not pass through it | opaque |
| The law of____ states that the angle of incidence always equals the angle of reflection | reflection |
| The line that is not perpendicular to the surface is called the_____ | normal |
| A____ ____ is an object that emits light | light source |
| Light speeds out in all directions from a ____ _____ | light source |
| A narrow beam of light that travels in a straight line is called a ___ ____ | light ray |
| Many objects____ light. Reflected___ _____ travel from an object to your eyes, allowing you to see the object | reflect, light waves |
| Dust scatters light. Scattering occurs when light waves traveling in one direction are made to travel in many ______ | directions |
| When light waves travel from one material to another, the light waves change speed and____ | direction |
| _____ is the change in direction of light waves when they travel from one material to another material | Refraction |
| The greater the change in_____ is, the more the light wave changes direction | speed |
| area of thinness(sound) | Rarefaction |
| bend (light) | refraction |
Created by:
caolmer