WorksheetsUnit 5 EM Spectrum and Light Tech
Total questions: 66
Worksheet time: 33mins
What is light a type of?
Sound
Matter
Energy
Liquid
How does light travel?
As particles
As waves
Through a medium
As a solid
What do light waves disturb?
Air and water
Electric and magnetic fields
The vacuum of space
Sound waves
What are the disturbances caused by light waves called?
Sound waves
Electromagnetic waves
Gravitational waves
Pressure waves
What is the term used to describe the transfer of energy as EM waves?
Conduction
Radiation
Convection
Reflection
What determines the color of light?
The intensity of light
The temperature of light
The wavelength of light
The speed of light
Which color of light has the shortest wavelength?
Red
Green
Blue
Violet
Which color of light has the longest wavelength?
Red
Green
Blue
Violet
What do we perceive when we see all the wavelengths of light at once, in equal proportions?
Black
Red
White
Yellow
Which part of the electromagnetic spectrum is used by cellular phones?
Radio waves
Microwaves
Infrared light
Gamma rays
What is the narrowest part of the electromagnetic (EM) spectrum that we can see?
Radio waves
Infrared light
Visible light
Ultraviolet light
What can ultraviolet light do that is beneficial to humans?
Cook food
Transmit radio signals
Treat illnesses
Heat homes
What is absorbed by bones in the electromagnetic spectrum?
Radio waves
Visible light
Infrared light
X-rays
What is the significance of gamma rays in medicine?
They are used to cook food
They are used to transmit radio signals
They are used to make medical images
They are used in televisions
What does the Earth's atmosphere primarily block from the sun's radiation?
Visible light
Radio frequencies
Higher frequency radiation
Ultraviolet radiation
Why are most ground-based telescopes radio telescopes?
Because radio frequencies are the only frequencies that reach the Earth
Because radio frequencies are completely blocked by the atmosphere
Because there is a small window of radio frequencies that are not blocked
Because radio frequencies are the most dangerous to humans
What can excessive exposure to ultraviolet radiation cause?
Improvement in skin health
Better vision
Skin cancer, sunburn, or damage to eyes
Increased bone density
What does higher frequency in electromagnetic (EM) radiation imply?
Less energy and less danger
More energy and more danger
More energy but less danger
Less energy but more danger
Which type of waves can pass through humans safely?
X-rays
UV waves
Radio waves
Microwaves
What can UV waves cause to living tissue?
No damage
Safe tanning only
Damage to living tissue
Improved skin health
What type of materials transmit light but do not let the light travel straight through, causing the light to scatter in many different directions?
Transparent materials
Opaque materials
Reflective materials
Translucent materials
What happens when light is absorbed by a material?
It is transmitted through the material.
It is reflected in a single direction.
It transfers energy to the material.
It scatters in many different directions.
How can you see an object?
When the object emits light.
When light from the object enters your eye.
When the object is completely dark.
When the object is transparent.
What is the term used to describe the phenomenon when light bounces off an object's surface?
Transmission
Absorption
Reflection
Scattering
Which of the following is an example of a transparent material?
Wood
Metal
Water
Stone
What does the diagram demonstrate?
The reflection of light on a surface
The refraction of light through a prism
The dispersion of light through a diffraction grating
The absorption of light by a filter
What color does an object appear if it reflects every color of light?
Black
Red
White
Gray
What color does an object appear if it absorbs every color of light?
Black
Red
White
Gray
How does the available light in an area affect the perceived color of an object?
It has no effect on the perceived color.
It changes the shape of the object.
It determines which colors are filtered out.
It increases the brightness of the object.
What is the perceived color of an object that is in a room with a red light bulb?
The object appears with a mix of all colors.
The object appears red or shades of orange and yellow.
The object appears blue or green.
The object appears white.
What does the term "color transmitted" refer to?
The color an object reflects.
The color an object absorbs.
The color that passes through a material.
The original color of the light source.
What is the speed of light in a vacuum?
200,000,000 m/s
300,000,000 m/s
400,000,000 m/s
500,000,000 m/s
What happens to light when it travels through a medium?
It goes faster
It changes color
It goes slower
It remains the same speed
What causes refraction of light?
Change in direction due to change in frequency
Change in direction due to change in amplitude
Change in direction due to change in speed as light enters a new medium
Change in direction due to change in phase
What is scattering of light?
Light bending around objects
Light being absorbed by a medium
Light being reflected at a single angle
Light being sent in many directions as it passes through a medium
Why is the sky blue?
Because of the reflection of oceans
Because of the scattering of light
Because blue light travels faster in the atmosphere
Because the atmosphere is inherently blue
What happens to sunlight as it passes through the air?
It remains unchanged.
Only the longest wavelengths are scattered.
Blue light is scattered first, making the sky appear blue.
All wavelengths are scattered equally.
Why does the sun appear yellow, orange, or red when it is near the horizon?
Because the sun emits only yellow, orange, and red light at that time.
Because the atmosphere scatters all the short wavelengths away.
Because the sunlight passes through more of the atmosphere, scattering short wavelengths and leaving the longest wavelengths.
Because the sun is cooler near the horizon.
What is demonstrated by the image of a pencil in a glass of water?
Reflection of light
Rayleigh scattering
Refraction of light
Diffusion of light
What is incandescent light produced from?
A cold material
A very hot material
A fluorescent coating
Ultraviolet light
What percentage of the energy given off by incandescent bulbs is in the form of light?
80%
8%
20%
50%
How is fluorescent light produced?
By passing electric current through a filament
By converting ultraviolet light into visible light
By cooling down the material inside the bulb
By emitting light from a very hot material
What percentage of the energy given off by fluorescent bulbs is in the form of visible light?
8%
20%
50%
80%
What do LEDs contain that allows them to emit light when energized by an electric current?
Gases
Liquid materials
Solid materials
Vacuum
LEDs emit light of how many colors?
A wide spectrum of colors
Only one color of light
Three primary colors
Invisible light only
What percentage of the energy given off by LEDs is in the form of visible light?
50%
75%
90%
100%
What is a unique characteristic of laser light?
It is non-coherent
It is incoherent
It is coherent
It is diffused
Lasers produce light that has:
A very wide range of wavelengths
A very small range of wavelengths
Only invisible wavelengths
Only ultraviolet wavelengths
What happens when the excited neon atoms in a Helium-Neon laser strike other excited neon atoms?
They absorb more photons.
They release photons of blue light.
They release photons that travel together.
They stop releasing photons.
What is the purpose of the partial coating on one mirror of the Helium-Neon laser?
To completely reflect all photons.
To increase the intensity of the light inside the tube.
To allow the laser light to escape and form a coherent beam.
To change the color of the laser light.
What is infrared radiation?
A type of sound wave that is undetectable by human ears
Visible light that can be seen by the human eye
Invisible electromagnetic radiation with a wavelength longer than our eyes can detect
A form of ultraviolet radiation used in medical imaging
Which of the following is an example of infrared technology?
Fiber optic cables
Night vision goggles
Radio broadcasting
X-ray machines
What are some applications of infrared technologies?
Mobile phone communication
Weather satellites and some space based satellites
Electric power transmission
Internet connectivity
What is an optical fiber?
A type of electrical cable
A thin transparent glass thread that transmits light over long distances
A plastic tube used for data storage
A metal wire that conducts electricity
What is the principle that allows light to stay inside the optical fiber?
Refraction
Diffraction
Total internal reflection
Polarization
Where is light emitted out from in an optical fiber?
The sides of the fiber
The end of the fiber
The cladding
It is not emitted out
For what purpose are optical fibers most used?
Transmitting electricity
Transmitting information through telephone cables
Transporting liquids
Heating purposes
What do satellites use to transmit data?
Sound waves
Electromagnetic waves
Physical cables
Water waves
What is one of the uses of satellites?
To provide lighting during nighttime
To send TV, radio, and cell phone data to homes
To transport goods to space stations
To generate electricity for cities
What is the purpose of some satellites specifically mentioned in the text?
To clean up space debris
To send weather data
To produce rain clouds
To study deep space
How many satellites are part of the Global Positioning System (GPS) network?
12
24
36
48
What is the function of the signals sent by GPS satellites?
To provide internet access worldwide
To measure positions on Earth's surface
To broadcast television channels globally
To control weather patterns
What does Doppler radar use to measure weather patterns?
Sound waves
Light in the form of radio waves
X-rays
Ultraviolet light
What happens to the radio waves after they are sent out by the Doppler radar?
They are absorbed by the clouds.
They pass through the clouds without interaction.
They bounce off the clouds and back to the transmitter.
They are refracted by the clouds and lost in the atmosphere.
What can laser technology be used for in manufacturing?
To cut, weld, and engrave certain plastics
To cut, weld, and engrave certain metals
To cut, weld, and paint certain woods
To cut, weld, and polish certain glasses
What medical application is mentioned for lasers in the text?
To shape the retina of the eye to correct eyesight
To shape the cornea of the eye to correct eyesight
To shape the lens of the eye to correct eyesight
To shape the iris of the eye to correct eyesight
