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Light, Sound and Waves
How light and sound behave, and the electromagnetic spectrum.
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59 cards
- What makes sound?QuestionVibrations
- Can sound travel in space?QuestionNo; it needs matter to travel through
- Does sound travel faster in air or water?QuestionWater
- Sound travels fastest throughQuestionSolids
- PitchQuestionHow high or low a sound is
- What determines pitch?QuestionFrequency
- Volume (loudness)QuestionHow strong a sound is; depends on amplitude
- Unit of loudnessQuestionDecibel
- EchoQuestionA sound that bounces off a surface and comes back
- UltrasoundQuestionSound with frequency too high for humans to hear
- InfrasoundQuestionSound with frequency too low for humans to hear
- Range of human hearing, roughlyQuestion20 to 20,000 hertz
- SonarQuestionUsing sound echoes to find objects underwater
- EcholocationQuestionAnimals such as bats and dolphins using echoes to find things
- Speed of sound in air, roughlyQuestion343 meters per second
- Sonic boomQuestionA loud noise made when something travels faster than sound
- Speed of lightQuestionAbout 300,000 kilometers per second
- Why do we see lightning before we hear thunder?QuestionLight travels much faster than sound
- Light travels inQuestionStraight lines
- Reflection of lightQuestionLight bouncing off a surface
- Refraction of lightQuestionLight bending when it enters a new material
- What does a prism do?QuestionSplits white light into a rainbow of colors
- Colors of the rainbow in orderQuestionRed, orange, yellow, green, blue, indigo, violet
- Which color of visible light has the longest wavelength?QuestionRed
- Which color has the shortest wavelength?QuestionViolet
- TransparentQuestionLets light pass through clearly
- TranslucentQuestionLets some light through but scatters it
- OpaqueQuestionBlocks light
- ShadowQuestionA dark area where an object blocks light
- Convex lensQuestionA lens thicker in the middle; makes light converge
- Concave lensQuestionA lens thinner in the middle; makes light spread out
- Plane mirrorQuestionA flat mirror that forms an image the same size as the object
- Concave mirrorQuestionA mirror curved inward, like the inside of a spoon
- Convex mirrorQuestionA mirror curved outward, used as a car side mirror
- Primary colors of lightQuestionRed, green and blue
- Primary colors of paint (traditional)QuestionRed, yellow and blue
- Why is the sky blue?QuestionAir scatters blue light more than other colors
- Why are sunsets red?QuestionLight passes through more air, scattering the blue away
- Electromagnetic spectrum order, long to short wavelengthQuestionRadio, microwave, infrared, visible, ultraviolet, X-ray, gamma ray
- Radio waves are used forQuestionRadio, TV and phones
- Microwaves are used forQuestionCooking and communications
- Infrared is felt asQuestionHeat
- Ultraviolet lightQuestionCauses sunburn and tanning
- X-rays are used forQuestionSeeing bones and inside objects
- Gamma raysQuestionThe highest-energy waves
- LaserQuestionA narrow beam of light of one wavelength
- Fiber opticsQuestionThin glass fibers that carry light signals
- Total internal reflectionQuestionLight bouncing entirely inside a material like glass or water
- MirageQuestionAn image caused by light bending in hot air
- WaveQuestionA disturbance that carries energy
- CrestQuestionThe highest point of a wave
- TroughQuestionThe lowest point of a wave
- AmplitudeQuestionThe height of a wave from rest position
- WavelengthQuestionDistance between two crests
- FrequencyQuestionWaves per second
- MediumQuestionThe material a wave travels through
- ResonanceQuestionA strong vibration when something is pushed at its natural frequency
- InterferenceQuestionWaves combining to be bigger or smaller
- Doppler effectQuestionA siren sounds higher as it approaches and lower as it leaves
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