Conestoga Science Chapter 12 & assessment 12.3.6
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49 terms
Terms | Definitions |
|---|---|
 What is a type of wave that can travel through empty space to transfer energy? | Light |
| Waves | Repeating disturbances that transfer energy through matter or space. |
| If the frequency of a water wave changes, with constant velocity, what else must also change? | Wavelength |
| What type of electromagnetic radiation is heat energy? | infrared |
| Why does silver have a lower resistance to electron flow than iron? | the nuclei holds electrons more loosely. |
| Equation to figure velocity | v=wavelength x frequency |
| Equation to figure wavelength | wavelength= velocity / frequency |
| Which waves have the lowest energy? | Radio waves |
| If the wavelength of a given wave decreases, you know that its frequency will....... | increase |
| What kind of waves produce heat (thermal energy)? | Infrared waves |
| How can the elements present in a star be determined? | By analyzing the light of a star's spectrum |
| A wave will travel as long as it has.......... | energy to carry. |
| How is the energy a wave carries measured? | By its frequency |
| How is an electromagnetic wave produced? | When a charged object accelerates. |
| What does an electromagnetic wave consist of? | Electric field & magnetic field ----vibrating at RIGHT angles |
| What kind of waves NEED a medium to travel through? | Water waves & Sound waves |
| What 3 things are in a cathode ray tube and what is the purpose of each? | Cathode- negatively charged device that sends out electrons Magnet- Magnetic field that focuses and guides the beam of electrons Coated screen- Glows when hit by electrons to produce the picture |
| What is used to kill bacteria on medical supplies? | Ultraviolet waves |
| GPS | Global Positioning System-----A system of satellites, ground monitoring stations, and receivers |
| How are changing electric and magnetic fields related? | They produce each other |
| What kind of energy does electromagnetic waves carry? | Radiant energy |
| Radar | A method in which police use radio waves to detect speeders. |
| As the frequency of an electromagnetic wave increases, the speed of the wave...... | stays the same. |
| Electromagnetic spectrum | The entire range of electromagnetic frequencies |
| Photon | a particle of light. Light can behave as a particle |
| What is a cell phone? | Transreceiver |
| Transreceiver | Device that transmits one radio signal and receives another radio signal at the same time, allowing a cordless phone user to talk and listen at the same time. Can send and receive messages. |
| What is a pager? | Radio receiver |
| Radio receiver | Can only receive messages. |
| Which frequencies are lower, AM or FM? | AM |
| What part of the electromagnetic spectrum is usually used for communication? | Radio waves |
| Why are gamma rays dangerous? | Because they break down molecules and cells |
| What does your body need to make vitamin D? | Ultraviolet waves |
| Which has a higher frequency, purple (violet) light or yellow light? | Purple (violet) |
| Which electromagnetic radiation has the shortest wavelength? | gamma rays |
| What is the particle that carries radiant energy? | Photon |
| What kind of waves are electromagnetic waves? | Transverse waves |
| What is the speed of electromagnetic waves in a vacuum? | 300,000 km/s |
| What do television satellites use to transmit? | Microwaves |
| What do CFCs or chlorofluorocarbons destroy? | the ozone layer |
| Ozone layer | layer of the stratosphere with a high concentration of ozone; absorbs most of the Sun's harmful ultraviolet radiation |
| What are the most energetic electromagnetic waves? | Gamma rays |
| The amount of energy a photon carries is determined by its ....... | frequency |
| Defend this statement. "Light has both a wave and a particle nature." | Light has all the properties of waves like refraction, diffraction, and interference. However, its energy depends upon frequency not amplitude which is like a particle. |
| Describe the ozone layer and explain why it is necessary for our health. | The ozone layer is high in our atmosphere. It absorbs most of the sun's harmful UV waves. |
| What are UVA and UVB? How are they alike and how are they different? | UVA- longer wavelength UV waves UVB-shorter wavelength UV. Both damage skin and can cause cancer and wrinkles. UVB causes sunburn. |
| How are sound waves and radio waves the same? How are they different? | Both are created by vibrations, experience refraction, diffraction, interference. Sound are compressional waves that need a medium. Radio are transverse waves and do not require a medium. |
| Why is a satellite telephone not convenient for two-way conversations? | Because of the great distances the signal must travel to and from the satellite, there can be annoying delays in the conversation. |
| Describe how a radio wave reaches your ear. 7 steps | 1. The radio wave sent from the radio station is picked up by your antenna. 2. The electrons vibrate providing a signal with information. 3. An amplifier boosts the signal and sends it to speakers. 4. The speakers vibrate 5. This causes a compressional wave which moves through the air. 6. Air molecules vibrate and send it to your ear. 7. The ear and brain interprets the sound. |
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