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Sound and Light
| Question | Answer |
|---|---|
| mechanical | |
| Sound waves must have a __________ to travel. | medium |
| Sound waves cannot travel through a _____________. | vacuum |
| Sound waves are formed by ___________ of an object. | vibrations |
| Waves move through an object | transmission |
| Sound waves travel _________ through a solid. Why? | faster; The particles are touching, so it is easier for one particle to make the next one vibrate. |
| Waves bouncing off a surface | reflection |
| Sound is repeated back | echo |
| Repeated echo | reverberation |
| Change in direction of a wave or bending of a wave as the wave passes from one medium to another with a different density | refraction |
| Refraction is caused by the change in a wave’s __________. | speed |
| When a material takes in energy | absorption |
| Energy is transformed into __________ when it is absorbed. | heat |
| Waves bend around an obstacle or spread out after passing through a small opening | diffraction |
| Wave hits small segments of a rough surface and reflect in many different directions | scattering |
| Light waves are ___________ waves. | electromagnetic |
| Light waves do not require a ________. | medium |
| Material that allows no light to pass through | opaque |
| Material that allows some light to pass through | translucent |
| Material that allows almost all light to pass through | transparent |
| What happens to light when it strikes an object depends on the _____ of the object. | material |
| What causes the beam of a light to appear dim? | Particles in the air absorb some of the light energy. |
| What allows us to see an object? | Light waves reflecting off an object. |
| Law of Reflection | Angle of reflection = angle of incidence |
| Line perpendicular to the reflected surface | Normal line |
| Amount a wave diffracts depends on | Its wavelength and the size of the barrier or opening |
| Why do light waves not diffract very much around an object? | Wavelengths are small. |
| Gives the illusion of a bent straw in a clear glass of water | refraction |
| Light bends more when its frequency is _________. | greater |
| Longest wavelength | red |
| Shortest wavelength | violet |
| Color with greatest angle of refraction | violet |
| Color with smallest angle of refraction | red |
| Why do leaves on a tree appear green? | The are absorbing all colors of light but green. |
| What are you seeing when you see color? | The frequency of light being reflected |
| Causes colors to separate when a white light hits a prism | refraction |
| Primary colors of light | Red, blue, green |
| Light travels slowest through _______. | gas |
| Pitch is determined by ______. | Frequency (higher pitch = higher frequency; lower pitch = lower frequency) |
| amplitude | How loud something is |
Created by:
brooklynwilliams
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