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Chapter 4 review
| Question | Answer |
|---|---|
| All sounds that people hear travel to the ears as | Sound waves |
| Sound waves travel through all kinds of _____ solids, liquids and gases | Matter |
| Objects that are _____ produce sound waves | vibrating |
| As the object move, outward, it pushes air molecules closer together, producing an _____ | compression |
| As the object moves inward, it pulls air molecules father apart, producing a _____ | rarefaction |
| A ______ is a series of rarefactions and compressions | Sound 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 a ______ | wavelength |
| The number of wavelengths that pass a given point in 1 second is a sound waves _____ is SI unit is ______ | frequency-hertz |
| A sound wave with a ______ frequency is produced by an object that vibrates quickly | high |
| The ______ of a sound waves depends on the kind of material the waves are traveling through | Speed |
| Sound waves generally travel faster through _____ and slowest through _____ | solids- gases |
| 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 _____ pitch | low |
| When you speak, you use your _____ 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--- leaves the system and when it returns to the system | Sonar-sound waves |
| Bats use _______ to hunt and help them navigate | echolocation |
| Ultrasound scanners convert ______ sound waves to images of internal body parts | high - frequency |
| light is a type of wave called _____ wave. | electromagnetic |
| light waves can move through ______, but they travel fastest when they move through _____. | 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 | bounce |
| 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 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 perpendicular to the surface is called the _____ | normal |
| a _____ _____ is an object that emits light | light source |
| light spreads out in all directions from a ____ | 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 abject. | 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 into 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 _______ the more the light wave change direction. | speed |
Created by:
brookemj1