Topic 8 Lesson 4

electromagnetic radiation

The energy that electromagnetic waves transfer through matter or space

radio waves

a system that uses reflected microwaves to detect objects and measure their distance and speed

light

an electromagnetic wave, which is a transverse wave

electromagnetic waves can transfer energy only in a vacuum

false

wavelength and frequency are related. in order for a wave to have a high _________, its wavelength must be short. waves with the shortest wavelengths have the _______ frequencies. frequency is also related to energy. high frequency waves have more ______, while lower frequency waves have less energy

frequency, highest, energy

radiosurgery is a tool that uses several hundred precisely focused _____ waves to target tumors

gamma

_____ rays have the ________ wavelengths with the _______ frequencies and energy; you would need a 3-4 inch thick concrete wall to stop them

gamma, shortest, highest

________ waves have _______ wavelengths and ______ frequency; are used for _______ ______ __ ___ ____, __ ______ _______

infrared, shorter, higher, finding people in the dark, TV remote control

of all the colors in the visible part of the electromagnetic spectrum, red light has the lowest frequency, the _______ wavelength, and the ______ energy

longest, lowest

electromagnetic wave

made up of vibrating electric and magnetic fields that can move through space at the speed of light

_____ _____ are used in mobile phones

radio waves

order these waves from lowest to highest frequency along the electromagnetic spectrum

radio waves, microwaves, infrared waves, visible light, ultraviolet rays, x-rays, gamma rays

_____ waves have the _______ wavelength and ______ frequency; are used for: _____, _______ _____, ________ _____________

radio, longest, lowest, radar, cooking foods, satellite transmissions

infrared radiation

the invisible heat you feel coming from the burner on an electric stove

when a beam of high-frequency light shines on some metals, it knocks some tiny particles called electrons out of the metal. this is called the photoelectric effect

true

___________ waves have a short wavelength, so the frequency and ______ is high with __ rays to penetrate living cells and cause damage

ultraviolet, energy, UV

x-rays

used to make images of bones and teeth in humans and animals

electromagnetic waves that you can see are called _______ light

visible

in the ____ model, light consists of electric and magnetic fields that are perpendicular to each other. in the ________ model, light behaves as a steam of particles

wave, particle

_-___ wavelengths have enough energy to penetrate deep into tissues, but are stopped by dense materials; used for ______ __ _____ __________

x-ray, looking at solid structures