2nd Peridocial Exam Reviewer (EM WAVES) Flashcards
What is the correct flow for radio communication and broadcasting?
Microphone, Modulator, Antenna, Demodulator, Amplifier, Speaker
Does tuner produces radio frequency carrier waves?
No
How does UV Light exhibit its germicidal effect?
UV LIGHT disrupts the reproductive abilities of bacteria and viruses.
How does the wavelength of infrared differ from the wavelength of ultraviolet rays?
Longer
Why are grammars rays more dangerous to human than visible light?
Gamma rays have greater energy than visible light for penetrating matter.
EM Waves order from shortest to longest wavelength
Gamma rays, X-Rays, UV Rays, Visible Light, Infrared, Microwaves, Radio
How can X-radiation be harmful and how it can be a useful diagnostic tool?
Overexposure to X-Rays can cause cancer, though in limited doses X-rays can be used for imaging internal body parts.
The speed of an EM Waves is equal to
Wavelength times frequency
An EM WAVES with a frequency higher than that of a gamma rays.
A Z-ray would have a shorter wavelength than gamma ray.
The fact that you can get sunburned while submerged in water is evidence that water is ____________.
Transmits ultraviolet light.
EM WAVES used for RADAR
Radio
Waves lie at the ends of the visible spectrum
Infrared and Ultraviolet Rays
Waves that are created as a result of vibrations between an electric and magnetic field?
Electromagnetic waves
Which property spells the difference between infrared and ultraviolet radiation?
Wavelength
In a vacuum, all EM WAVES have the same ________.
Speed
Which WAVES that tans our skin?
Ultraviolet
EM WAVES used to cook food, predict the weather and for communications?
Microwaves
Gamma rays have the highest frequencies and radio waves have the lowest frequencies. what does this statement imply?
Gamma rays have the most energy and radio waves have very little energy.
In a vacuum, EM RADIATION of short wavelengths ____________.
Travels as fast as radiation of long wavelengths
Which wavelength of the EMR can penetrate human tissue?
Gamma
CLASSIFY
A father watching NBS via satellite
Microwaves
CLASSIFY
Camera autofocusing
Infrared
CLASSIFY
Using remote controls
Infrared
CLASSIFY
Treating cancer
Gamma
CLASSIFY
Using red emergency light on cars
Visible Light
CLASSIFY
Checking of bank signature
UV Light
CLASSIFY
Sterilization of water in drinking fountains
UV Light
CLASSIFY
Diagnosis of bone structure
X-ray
CLASSIFY
Using optic fibers in wiring
Visible Light
CLASSIFY
A policeman officer uses RADAR for Speed Control
Radio
CLASSIFY
Used to inspect welded joints in industry
X-ray
CLASSIFY
A dentist obtaining an image of the root of a tooth
X-ray
CLASSIFY
Cooking food
Microwaves
CLASSIFY
Used in phototherapy
Visible Light
CLASSIFY
Help to produce Vitamin D
UV Light
They are smaller wavelength than radio waves.
Microwaves
Also called as HEAT RAYS
Infrared
When white light passes through prism, it is separate into constituent colors: ROYGBIV
Visible Light
Sun is the main source of ___________.
UV Radiation
Who discovered X-ray?
Wilhelm Conrad Roentgen
Type of X-ray that uses to help doctors look inside the body
Long-wavelength X-ray
They are shortest wavelength and highest frequency.
Gamma Rays
They are used in treating cancer called _______.
Radiotherapy
CLASSIFY
Used for sterilization of drinking water
Gamma Rays
EM Waves have an electric magnetic field that travels _________ with the magnetic field.
Perpendicular
EM WAVES order from lowest frequency to highest frequency.
Radio,Microwaves, Infrared, Visible Light, UV Light, X-ray, Gamma Ray
Em WAVES order from lowest energy to highest energy.
Radio,Microwaves, Infrared, Visible Light, UV Light, X-ray, Gamma Ray
Lowest frequency, lowest energy and longest wavelength
Radio waves
Converts sound wave to audio-frequency signal
Microphone
Extract AF SIGNALS from modulated carrier wave
Demodulator
