Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
28 Cards in this Set
- Front
- Back
|
Form of energy that travels at the speed of light and uses electric and magnetic fields |
Electromagnetic waves |
|
|
Electromagnetic waves can travel through a |
Vacuum (empty space) |
|
|
Two characteristics of electromagnetic waves |
Wavelength and frequency |
|
|
Distance between two points on a wave |
Wavelength |
|
|
Number of waves that pass a point in one second |
Frequency |
|
|
A collection of EM Waves of all known frequencies |
Electromagnetic spectrum |
|
|
What type of radiation carries the most energy |
Gamma |
|
|
Gamma waves |
Shortest wavelength and highest frequency Produced by hottest objects in universe Kills living cells Used to sterilize medical equipment kill bacteria and treat cancer |
|
|
What type of radiation has high energy through soft tissue and matter but lower energy in hard tissue and matter |
X rays |
|
|
X rays |
Can damage or kill living cells so precautions must be taken Used in medical imaging in security screening devices |
|
|
What type of radiation has both positive and negative affects a living organisms |
Ultraviolet (UV) |
|
|
Ultra violet |
Helps produce vitamin D in the skin and causes tanning Prolonged exposure causes sunburns and skin cancer Most UV radiation is blocked by the ozone layer Can be used to disinfect objects and in black lights |
|
|
What type of radiation is the only part of the spectrum it is detectable by the Human eye |
Visible light |
|
|
Visible light |
Allows us to see different colors Objects reflect the color of the spectrum you see and absorb the other colors |
|
|
Visible light order from longest wavelength to shortest |
Red Orange yellow Green blue indigo Violet |
|
|
What type of radiation cannot be seen by humans but is felt as heat |
Infrared |
|
|
Infrared |
Wavelength longer than visible and have frequencies which are Lower than visible Used in thermal imaging cameras and TV remote controls Can be used to observe faint objects in space |
|
|
What type of radiation can pass easily through earths atmosphere so they can be used to transmit signals |
Microwaves |
|
|
Microwaves |
Also used to cook food in radar detectors And cell phones Microwave ovens work by causing water and fat molecules to vibrate Some scientist believe prolonged exposure to microwaves through cell phones and other devices can lead to brain cancer |
|
|
What type of radiation carries the least amount of energy |
Radio waves |
|
|
Radio waves |
Longest wavelength lowest frequency Main use is communication |
|
|
Radio one |
Used to transmit information |
|
|
Microwaves one |
Used in cell phones and might cause cancer |
|
|
Infrared One |
Human release this in the form of heat |
|
|
Visible light one |
Only part of the spectrum that the human eye can detect |
|
|
Ultra violet one |
Prolonged exposure can harm skin |
|
|
X-rays one |
Damaging to soft tissue used for medical imaging |
|
|
Gamma rays one |
Kills living cells |
