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Beaver Local 16
| Question | Answer |
|---|---|
| A longitudinal wave that is caused by vibrations and that travels through a medium | Sound Wave |
| The speed of sound depends on the ____________ and temperature | Medium |
| Sound waves travel ___________ in air than in a solid because the molecules in a gaseous medium are farther apart | Slower |
| In which medium would vibrations travel more rapidly: liquid or a solid? | Solid |
| In which medium would vibrations travel more rapidly: liquid or gas? | liquid |
| Name a solid that would "dampen" vibrations and act as a sound barrier. | Rubber |
| Loudness of sound is determined by __________ | Intensity |
| The rate at which a sound wave transmits energy through a given area of a medium | Intensity |
| A sound seems twice as loud when its intensity is __________ times the intensity of another sound | 10 |
| A measure of how high or low a sound is | Pitch |
| ________________ depends on the sound wave's frequency | Pitch |
| A ____ ______ sound is made by something vibrating rapidly | high-pitch |
| A ____ ______ sound is made by something vibrating slowly | low-pitch |
| High-pitch sounds have ________ frequencies | high |
| Low-pitch sounds have ______ frequencies | low |
| Slow vibrations of frequencies lower than 20 Hz | infrasound |
| Any sound wave with frequencies high than 20,000 Hz | ultrasound |
| A phenomenon that occurs when two objects naturally vibrate at the same frequency | Resonance |
| The ______ _____ is a sensative organ that senses vibrations in the air, amplifies them, and then transmits signals to the brain | human ear |
| The 3 regions of the ear are: | outer, middle, and inner ear |
| _____________ sound waves are used to determine distances and to create images | Reflected |
| A system that uses reflected sound waves for measurement and can measure large distances | Sonar |
| Using sonar, the _____________ can be determined by measuring the time it takes for sound waves to be reflected from a surface | distance |
| What is the equation for determining distance? | d = vt |
| Light can be modeled in these 2 ways? | 1. wave; or 2. stream of particles |
| In the wave model, light is described as what type of wave? | Transverse |
| T or F: Light does not require a medium in which to travel | T |
| Lights are called ___________ _________ because they consist of changing electric and magnetic fields | Electromagnetic waves |
| The wave model of light describes transverse waves by their _____________, wavelength, and frequency | amplitude |
| This model explains the effects of light when it interferes with objects | Stream of particles model |
| A unit or quantum of light | Photon |
| Which is located in a specific area of a light wave: energy or a photon? | A photon |
| The energy of light is proportional to __________________ | Frequency |
| The frequency of ultraviolet waves is about ______ times the frequency of red light waves. | 2 |
| The speed of light depends on the ___________ | medium |
| In a vacuum, all light travels at the same speed and is represented by the variable ___ | c |
| The brighness of light depends on ____________ | intensity |
| The quantity that measures the amount of light illuminating a surface is _______________ | intensity |
| The intensity of light decreases as distance from the light source _________________ | increases |
| the rate at which energy flows through a given area of space is _______________ | intensity |
| Intensity of light depends on the ________ __ ________ per second, or power, that pass through a certain area of space | number of photons |
| What are the longest waves in the electromagnetic spectrum? | Radio waves |
| What part of the electromagnetic spectrum includes TV signals, AM and FM radio signals? | Radio Waves |
| What system of the electromagnetic spectrum do air traffic control towers use | Radar |
| Electromagnetic waves that have wavelengths in the range of centimeters are known as ____________ | microwaves |
| Microwaves are reflected by _________ and are easily transmitted through air, glass, paper, and plastic | metals |
| The energy from absorbed ______________ causes water and other molecules to rotate and warm food | microwaves |
| Name three devices that use infrared light. | 1. weather satellites; 2. photographic film; 3. computers |
| The invisible light that lies just beyond violet light falls into the _______________ part of the spectrum | ultraviolet (UV) |
| ____ % of the energy emitted by the sun is ultraviolet light | 9 |
| What part of the Earth's atmosphere absorbs UV light? | Ozone layer |
| What waves are beyond the ultraviolet part of the spectrum and are used in medicine? | x rays and gamma rays |
| Every object ____________ some light and __________ some light | reflects; absorbs |
| A line in space that matches the direction of the flow of radiant energy | light ray |
| _______________ surfaces reflect light rays in many directions | Rough |
| The reflection of light into random directions is called ___________ ____________ | diffuse reflection |
| Relative intensity of sound is measured in units that have the symbol ___ | dB |
| Sound waves travel faster through liquid water than through air because the particles of the liquid transfer energy better than the particles in a _________. | gas |
| A flat mirror forms an image that is ___________ | virtual |
| Microwaves are higher in energy than _________ _____________ | radio waves |
| Light can be modeled as a stream of particles called ______________ | photons |
| In the eye, most of the refraction of light is done by the: | cornea |
| The energy of a photon is proportional to the: | the frequency of a wave |
| When white light passes through a prism, the light is separated into the colors in the visible spectrum because the _________________ of light travel at different speeds in the prism | wavelengths |
| The angle of incidence equals the angle of reflection | Law of Reflection |
| __________ mirrors form virtual images by reflection | Flat |
| An image from which light rays appear to diverge, even though they are not actually focused there | virtual image |
| T or F: A virtual image CAN be projected on a screen | F: CANNOT |
| An image that is formed by the intersection of light rays | Real image |
| This image CAN be projected on a screen | Real image |
| Mirrors that bulge and distort images | Convex mirrors |
| Mirrors that indent and magnify objects | Concave mirrors |
| T or F: The colors that you perceive depend on the wavelengths of visible light that reach your eye | T |
| Light waves bend, or _________, when they pass from one transparent medium to another | refract |
| ________________ makes objects appear to be in different positions | Refraction |
| T or F: Refraction creats virtual images | True |
| _______________ in the atmosphere creates mirages | Refraction |
| A transparent object that refracts light waves such that they converge or diverge to create an image | Lens |
| A _______________ lens bends light inward | converging |
| A _______________ lens bends light outward | diverging |
| This type of lens creates virtual AND real images | Converging lens |
| This type of lens can ONLY create a virtual image | Diverging lens |
| _______________________ is any change in the size of an image compared witht he size of the object | Magnification |
| In optics, a system that consists of 2 or more plane surfaces of a transparent solid at an angle with each other | prism |
| In optics, the process of separating a wave (such as white light) of different frequencies into its individual component waves (the different colors) | Dispersion |
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kjones0722
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