Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Electromagnetic Wave
8th Grade Science Study Guide
| Question | Answer |
|---|---|
| Electromagnetic Waves with longer wavelengths have_______. | lower frequencies |
| Electromagnetic waves with the longest wavelengths are_____. | radio waves |
| Electromagnetic waves with the greatest amount of energy are ___. | gamma rays |
| Sources of gamma rays include______. | the sun, collapsing stars, and radioactive decay |
| Visible light with the highest frequencies appear to our eyes as the color _____. | violet |
| Sources of infrared light include_____. | the sun, flames, and living things |
| Electromagnetic waves are _______. | transverse waves. |
| Which type of electromagnetic waves are used for radar? | Microwaves |
| The highest-frequency electromagnetic waves ________. | are harmful |
| What is the equation that shows the relationship of wave speed to wavelength and wave frequency? | Speed= Wavelength x Frequency |
| AM radio waves ____________________________________________--. | have longer wavelengths than FM radio waves are encoded with signals by changing their amplitude reflect off the ionsphere |
| Gamma rays can pass through skin, bones and teeth (T or F) | True |
| Ultraviolet light can be used to kill bacteria in food. (T or F) | True |
| Microwave signals can be interrupted by building and other obstructions. (T or F) | True |
| Higher-frequency electromagnetic waves have less energy. (T or F) | False |
| All electromagnetic waves travel at the same speed through space (T or F) | True |
| Radio waves have the least energy of all electromagnetic waves. (T or F) | True |
| The only use of x-rays is to make images of bones and teeth in the body. (T or F) | False |
| Gamma Rays from space are absorbed by Earth's atmosphere. (T or F) | True |
| Electromagnetic waves need a medium in order to transfer energy. (T or F) | False |
| What is the speed of light? | 300 million m/s |
| Fm radio waves are encoded with signals by changing their _____. | frequency |
| _____ is the distance between corresponding points of adjacent waves. | Wavelength |
| _____ is the number of waves that pass a fixed point in a given amount of time. | Frequency |
| Gamma rays can be used to treat ____. | Cancer |
| The transfer of energy by electromagnetic waves is called electromagnetic ________. | radiation |
| The most important source of electromagnetic waves on Earth is the ____. | Sun |
| The bright areas on an X-ray film show where the rays were _____ by bones or teeth. | reflected |
| Electromagnetic waves with the highest energy levels are called____. | Gamma Waves |
| When electromagnetic waves strike matter they may be ____ , _____ or refracted. | absorbed, reflected |
| Electromagnetic waves that consist of vibrating _____ and _____ fields | electric, magnetic |
| Explain how you can protect your skin from ultraviolet light (name 2) | Wear clothing that covers your skin Apply Sunscreen to any exposed areas Wear a hat to protect your head |
| Explain how reflected microwaves are used to determine the speed of an oncoming car. | As a car approaches the radar gun, the reflected microwaves get bunched up in front of the car. The waves the receiver detects have a higher frequency than they would if they were being reflected from a stationary object. |
| The faster the car is moving , the greater the increase in the frequency of the waves. | |
| Explain why AM radio broadcasts can travel farther than FM radio broadcasts. | AM broadcasts use longer wavelength radio waves than FM, because of their longer wavelengths, AM waves reflect off the ionosphere; this allows them to reach radio receivers that are very far away. |
| Explain how an electromagnetic wave begins. | When an electrically charged particle vibrates. |
| Describe Einstein's wave - particle theory about electromagnetic radiation. | Electromagnetic radiation can behave like both a wae and a particle. |
| List all the waves of the electromagnetic spectrum in order from lowest to highest frequency. | Radio- Microwave- Infrared- Visible Light- Ultraviolet- X-ray- Gamma |
Created by:
cromine