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Description
Flashcards by Thifany Ramirez, updated more than 1 year ago
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Created by Thifany Ramirez
almost 8 years ago
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| Question | Answer |
| What are waves? | A wave is a disturbance involving the transfer of energy from one place to another. |
| Explain what causes mechanical waves and the main characteristics of waves. | They need a medium to travel. They transfer energy by the vibration of particles in a medium. There are three types: longitudinal, surface, and transverse. Mechanical waves form when a source of energy causes a medium to vibrate. |
| Identify, list and describe the three types of mechanical waves. | Longitudinal Waves: are waves that vibrate the medium in the same direction in wich Transverse Waves: is a wave that vibrates the medium at right angle or perpendicular Surface Waves: are a combination of transverse and longitudinal waves. Tralves along |
| Identify the parts of a transverse wave | |
| Identify the parts of a longitudinal wave | |
| Describe the basic properties of waves (amplitude, wavelength, frequency, and speed). | -Amplitude: is the maximum distance the medium vibrates from the rest position. -Wavelegth: the distance between two corresponding parts of the wave. From crest to crest or from trough to trough. -Frequency: the number of waves that pass in a given point in a certain amount of time. It is measured in Hertz (Hz). -Speed: how far the wave travels in a given amount of time. |
| Explain how a waves speed is related to its wavelength and frequency. | -The higher speed the wave has the faster it would pass through a point so the speed can alterait the frequency. |
| Explain how a waves amplitude is related to its energy. | -The bigger its amplitude the bigger its energy. |
| Determine a waves speed, frequency, and wavelength using a given formula | - speed= wavelength x frequency - Frequncy= speed % wavelength - wavelength= speed % frequency |
| Describe how relflection, refraction, and deffraction change a waves direction. Provide examples. | -Reflection: when a wave hits a surface, any part of the wave that cannot pass through the surface so the wave bounces back. Example: when you look yourself in the mirror. -Refraction: is the bending of waves due to a change in speed. Example: when you put a straw into a glass of water. -Diffraction: when a wave moves around barrier or though an opening in a barrier, it bends and spreads out. Example: when there is a big rock in the ocean and the ocean wave surrounds it. |
| State the different types of interference. | -Constructive Interference. -Destructive Interference |
| Understand the Law of Reflection and label the angles and the waves. | -The Law of Relfection states that the angle of incidence equals the angle of reflection. |
| What is an electromagnetic wave? | -Is a transverse wave that involves the transfer of electric and magnetic energy. |
| State what an electromagneticwave consists of. Provide main characteristics. | -An electromagnetic wave is made up of vibrating electric and magnetic fields that move through space or some medium at the speed of light. -The energy that electromagnetic waves tranfer through matter or space is called electromagnetic radiation. -They do not requirea a medium, so they transfer energy through a vacuum, or empty space. |
| Explain how electromagnetic waves are alike and how they are different. | -They travel at the same speed at a vacuum, but they have different frequencies and wavelengths, and different amount of energy. -All have different uses. -Only visible light can bee seen. -All are part of the electromagnetic spectrum. |
| Describe and compare the waves that make up the electromagnetic spectrum. And their uses everyday life. | Radio waves • Electromagnetic Waves with the longest wavelengths have the lowest frequencies are radio waves. • Are used in broadcasting to carry signals for radio programs. • There are 2 types: FM and AM • Have the shortest frequency. Microwaves • Has a shorter wavelength than radio waves. • Has a higher frequency than radio. • Microwaves cell phones and radar . • Radar sends a microwave that reflects an object and that measures the distance and speed. Infrared rays • Is the invisible heat you feel. • It has a shorter wavelength than microwaves. • It has higher frequency than microwaves. • They are called The Heat. Visible light • Are electromagnetic waves that we can see . • They make a very small part of the electromagnetic spectrum. • Visible light that appears white is often a mixture of colors. • It has shorter wavelength and higher frequency than infrared rays. Ultraviolet rays • Has a shorter what is blank than visible light. • Has higher frequency than visible light. • The energy of this wave tank here living cells. • It can give cancer. X-rays • They have |
| Explain how radio waves are produced and transmit information. | -Charged particles vibrating inside a transmition antena produce radio waves -The transmition antena sends out radio wave in many directions, radio waves carry information from the brodcast station antena to the reciving antena of your radio. |
| Explain how cell phones work. | -First: When you place a cell-phone call, the phone sends out microwaves, which are tagged with a number unique to your phone. -Second: A tower picks up the microwaves and transfers the signal to a hub. -Third: The hub channels and transmits the signal to a reciver. The reciver may be another tower or hub, depending on the distance between the two phones. -Forth: The tower or hub transmits the signal to the reciving cell phone. -Fifth (last): The reciving phone rings when it picks up the signal. |
| Explain how communications satellites work. And why they are important. | -Communications satellites work like the recivers and transmitters of a cellular phone system. -Global Positioning System (GPS): GPS satellites send signals to tell you the exact location and altitude on earth. -Satellite Phone System: satellite phones use satellites to transmit and recive calls anywhere in the world. -Television Satellites: television satellites allow networks and cable companies to transmit signal. |
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