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chapter 3 sect.1 & 2
Stack #165119
| Question | Answer |
|---|---|
| What is an electromagnetic wave? | traverse waves that have some electrical properties and some magnetic properties |
| What do electromagnetic waves consist of? | changing electric and magnetic fields |
| When does an electromagnetic wave occur? | when electric and magnetic fields vibrate at right angels to each other,when one field changes so does the other |
| Do electromagnet waves need a medium to transfer energy? | if it could not, light from the sun and stars could not travel through space to Earth. NASA officials could not make contact with space shuttles in space |
| What is energy that is transferred by electromagnetic waves called? | electromagnetic radiation |
| Examples of electromagnetic waves are: | radio, cordless or cellular phone, felt warmth on your skin, turned ona light, x-ray |
| Do all electromagnetic waves travel at the same speed? | yes |
| How fast do electromagnetic travel? | 300,000 kilometers per second in a vacuum |
| What is the difference between sound waves, waves in water, and electromagnetic waves? How are they alike? | sound waves and waves in the water travel through a medium and electromagnetic waves do not, all travel at the same speed |
| When light passes through a polarizing filter, does it have the properties of wave? | yes |
| What is polarized light? | light that vibrates in only one direction |
| What is the photoelectric effect? | a beam of light shines on some substances causing tiny particles (electrons) to move. The movement of the particles causes an electriccurrent to flow |
| photon | tiny packets or particles of energy |
| What are the differences in all electromagnetic waves? How are they alike? | In order of frquency- radio waves, infrared rays, visible light, ultraviolet rays, x-rays, and gamma waves |
| What is the electromagnetic spectrum? | the name for all the range of electromagnetic waves when they are placed in order of increasing frequency |
| Who first suggests that light travels as photons? | Albert Einstein in 1905 |
| What do electromagnetic waves consist of? | changes in electric and magnetic fields |
| Describe one behavior that shows that light is a set of particles. | beam of light shine on some substances, it causes particles called electrons to move. this movement causes an electric current to flow.Sometimes light can even knock electrons out of the substance |
| Describe one behavior that shows that light is a wave. | When light passes through a polarizing it has the properties of a wave. An ordinary beam of light has waves that vibrate in all directions. A polarizing acts as though it has tiny slits that are either horizontal or vertical. When light enters a polarizin |
| What is a magnetic field? | a region where charged particles can be pushed and pulled.whenever there is a change, there is a field associated with it |
| What is a magnetic field? | Magnetic field magnetic forces present |
| What is an electric field? | Electric charges surrounded by magnetic field |
| Electromagnetic radiation | energy that is transferred by electromagnetic waves |
| How are the waves transmitted to a radio? | Some radio waves travel through a vacuum,but most travel through air. The antenna picks up the wave and transmits it through wires in a radio. The radio converts the electromagnetic waves to sound. Stations broadcast through frequencies.When you turn on t |
| How are the frequency and wavelenght of electromagnetic waves related? | wavelength decreases, the frequency increases- Waves with the longest wavelenghts have the lowest frequencies. Waves with shortest wavelenghts have highest frequencies. The higher the frequency of a wave, the higher its energy |
| What are radio waves? | electromagnetic waves with the longest wavelengths and lowest frequencies |
| Name some types of radio waves | radar, microwaves. MRI Magnetic Resonance Imaging |
| microwaves | radio waves with the shortest wavelengths and lowest frequencies |
| Explain how microwaves heat food | Turn on a switch and electromagnetic waves bounce around in oven and penetrate food. Water from food absorbs energy from waves and makes food hot |
| Explain how radio are used to find the speed of a moving object | The radar gun sends radio waves towards a moving car. The waves are then reflected. Because the car is moving, the frequency of the reflected waves is different from the frequency of the waves that are sent out. The radar device uses the difference in f |
| Infrared rays | Turn on a stove electric part gets red which is infrared rays. As stove gets warmer turn on energy which is heat. shorter wavelengths and higher frequency. Lower frequency than radio waves. Infra means red |
| Examples of infrared ray | Thermogram which measure energy through color used for housing structures to detect energy leaks. Another example is heat lamp found in a bathroom |
| Examples of ultraviolet, gamma rays and x-rays | Ultraviolet rays-your body produce vitamin D. In larged quantites, they can cause sunburn or even skin cancer. Also used to kill bacteria in hospitals and processing plants X-rays- absorbed by denser tissues, such as bone. These show up as the white part |
| Visible light | Visible light has shorter wavelengths and higher frequencies than infrared waves |
| How are X-rays useful? How are they danferous? | They are useful in diagnosing and treating cancer, however too much gamma rays can cause cancer |
| Describe the spectrum of visible light. | longest wavelengths of visible light are red. as the wavelengths decrease and the frequencies increase, you can see other colors of light. The shortest wavelengths are purple or violet |
| What are the colors of the visible spectrum? | Red, orange blue, yellow ,violet in order of increasing frequency |
| Ultra violet | Ultra is a latin prefix meaning beyond so ultraviolet rays are beyond violet UV waves have higher frequencies than visible light, so they carry more energy |
| What does a bee see? | less of red waves and higher frequency of ultra violet waves |
| Gamma rays | shortest wavelengths and highest frequencies of the electromagnetic spectrum. Most penetrating because they have the greatest amount of energy |
| X-rays | electromagnetic waves with very short wavelenghts,their frequencies are just a little higher than ultraviolet rays |
Created by:
phillip clark
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