Podcast
Questions and Answers
Why can you see an explosion in space but not hear it?
Why can you see an explosion in space but not hear it?
- Sound travels faster than light in a vacuum.
- Space is a vacuum, so sound cannot travel through it, but light can. (correct)
- Light is not produced by explosions in space.
- Explosions in space do not produce sound.
Which type of electromagnetic radiation has the highest frequency?
Which type of electromagnetic radiation has the highest frequency?
- Infrared
- Radio waves
- Microwaves
- Gamma rays (correct)
Which type of electromagnetic radiation has the longest wavelength?
Which type of electromagnetic radiation has the longest wavelength?
- X-rays
- Radio waves (correct)
- Gamma rays
- Ultraviolet
Which of the following correctly orders electromagnetic radiation from highest to lowest energy?
Which of the following correctly orders electromagnetic radiation from highest to lowest energy?
What happens when light is absorbed by a material?
What happens when light is absorbed by a material?
Why does absorbed light energy often get converted into thermal energy?
Why does absorbed light energy often get converted into thermal energy?
What is the term for when light bounces off an object?
What is the term for when light bounces off an object?
Why do we perceive an apple as red?
Why do we perceive an apple as red?
What type of window material would allow light to pass through while also providing privacy?
What type of window material would allow light to pass through while also providing privacy?
What happens to the speed and path of a light wave when it travels from air to glass?
What happens to the speed and path of a light wave when it travels from air to glass?
What property of light is determined by its frequency?
What property of light is determined by its frequency?
What property of light is determined by its amplitude?
What property of light is determined by its amplitude?
What two fields, working together, create light waves?
What two fields, working together, create light waves?
Why is it generally recommended to wear white clothing in the summer?
Why is it generally recommended to wear white clothing in the summer?
According to the diagram, in which medium does light travel the fastest?
According to the diagram, in which medium does light travel the fastest?
Which of the following is an example of a mechanical wave?
Which of the following is an example of a mechanical wave?
Which of the following is an example of an electromagnetic wave?
Which of the following is an example of an electromagnetic wave?
How does the speed of light change as the density of the medium increases?
How does the speed of light change as the density of the medium increases?
Which of the following is a characteristic unique to light waves, not sound waves?
Which of the following is a characteristic unique to light waves, not sound waves?
Which of the following is a similarity between light and sound waves?
Which of the following is a similarity between light and sound waves?
Which of the following is an example of analog data?
Which of the following is an example of analog data?
Which of the following is a characteristic of digital data?
Which of the following is a characteristic of digital data?
How do the iris and pupil work together to control the amount of light entering the eye?
How do the iris and pupil work together to control the amount of light entering the eye?
What structure in the eye is primarily responsible for focusing light onto the retina?
What structure in the eye is primarily responsible for focusing light onto the retina?
Which type of cells in the retina are responsible for color vision?
Which type of cells in the retina are responsible for color vision?
Which type of cells in the retina are primarily responsible for vision in low light conditions?
Which type of cells in the retina are primarily responsible for vision in low light conditions?
What type of electromagnetic wave is used to diagnose broken bones?
What type of electromagnetic wave is used to diagnose broken bones?
What type of electromagnetic waves are used in remote controls and thermal imaging?
What type of electromagnetic waves are used in remote controls and thermal imaging?
Which electromagnetic waves are the only ones that humans can perceive as light?
Which electromagnetic waves are the only ones that humans can perceive as light?
What colors of light does a yellow object reflect?
What colors of light does a yellow object reflect?
Which color of light does a yellow object absorb?
Which color of light does a yellow object absorb?
If blue light is shone on an object and the object appears black or very dark, what does this indicate about the object's color?
If blue light is shone on an object and the object appears black or very dark, what does this indicate about the object's color?
If blue and green light are off but the object is illuminated with red light and appears red, what does that indicate about the object's color properties?
If blue and green light are off but the object is illuminated with red light and appears red, what does that indicate about the object's color properties?
The cochlea is to the auditory nerve as the retina is to the:
The cochlea is to the auditory nerve as the retina is to the:
Why does oil refract a pencil more than water?
Why does oil refract a pencil more than water?
Flashcards
Why can we see explosions in space, but not hear them?
Why can we see explosions in space, but not hear them?
Space is a vacuum, so sound cannot travel through it. Light does not need a medium to travel.
What EM light has the highest frequency?
What EM light has the highest frequency?
Gamma rays
What EM light has the longest wavelength?
What EM light has the longest wavelength?
Radio waves
Which light has the highest and lowest energy?
Which light has the highest and lowest energy?
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What does it mean to transmit light?
What does it mean to transmit light?
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What surface types allow light to transmit?
What surface types allow light to transmit?
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What does it mean for light to be absorbed?
What does it mean for light to be absorbed?
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Why does absorbed light energy convert to thermal energy?
Why does absorbed light energy convert to thermal energy?
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What is reflection?
What is reflection?
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What is the relationship between light reflection and color? Why are apples red?
What is the relationship between light reflection and color? Why are apples red?
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What type of window allows light to pass through but provides privacy?
What type of window allows light to pass through but provides privacy?
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What happens to light's speed and path when traveling through different mediums?
What happens to light's speed and path when traveling through different mediums?
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How do frequency and amplitude affect light waves?
How do frequency and amplitude affect light waves?
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What two fields create light waves?
What two fields create light waves?
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Why wear white clothing in summer?
Why wear white clothing in summer?
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Where does light travel the fastest?
Where does light travel the fastest?
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What are the two types of waves?
What are the two types of waves?
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Give two examples of mechanical waves.
Give two examples of mechanical waves.
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Give one example of EM wave
Give one example of EM wave
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Compare the speed of light and sound as density changes.
Compare the speed of light and sound as density changes.
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Sound wave
Sound wave
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Both wave types
Both wave types
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Light wave
Light wave
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Analog statement
Analog statement
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Digital
Digital
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Iris and Pupil
Iris and Pupil
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What structure of the eye focuses light onto the retina?
What structure of the eye focuses light onto the retina?
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What cells in the retina are responsible for color?
What cells in the retina are responsible for color?
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What cells in the retina are responsible for vision in low light?
What cells in the retina are responsible for vision in low light?
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What energy makes cochlea and the retina take sound or light?
What energy makes cochlea and the retina take sound or light?
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These waves make water molecules vibrate
These waves make water molecules vibrate
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High energy waves given off by radioactive materials
High energy waves given off by radioactive materials
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Waves used to give off signals
Waves used to give off signals
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Cause sunburn
Cause sunburn
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Diagnose broken bones
Diagnose broken bones
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Used in remotes, thermal imaging, and medicine
Used in remotes, thermal imaging, and medicine
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Light humans can perceive
Light humans can perceive
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What color does yellow object reflect?
What color does yellow object reflect?
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What color does yellow object absorbs
What color does yellow object absorbs
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Red and green are off, what color does the object appear?
Red and green are off, what color does the object appear?
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Blue and green are off, but red is on, what color does the object appear?
Blue and green are off, but red is on, what color does the object appear?
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Study Notes
Wave Properties and Behavior
- Sound cannot travel through space because space is a vacuum
- Light doesn't need a medium like a vacuum to travel
- Reflection occurs when light bounces off an object
Electromagnetic Spectrum
- Light is transferred to matter when it is absorbed
- Absorbed light energy converts into thermal energy, making things warmer
- Reflected light allows you to see objects
- Apples appears red because they absorb all colors except red, which is reflected
Electromagnetic Spectrum Types
- Gamma rays have the highest frequency
- Radio waves have the longest wavelength
- Gamma rays have the highest energy
- Radio waves have the lowest energy
- Microwaves vibrate water molecules
- Gamma Rays are high energy waves given off by radioactive materials
- Radio waves are used to give off signals including Wi-Fi and text messages
- Ultraviolet light causes sunburn
- X-rays diagnose broken bones
- Infrared waves are used in remotes, thermal imaging, and medicine
- Visible light is the only EM wave humans can perceive
Light Transmission
- Transparent and translucent surfaces allow light to transmit through
- Light's speed and path change when it travels through different mediums
- A translucent window is a suitable material for a bathroom window needing privacy
- Light travels the fastest in a vacuum and slowest in a diamond
Frequency and Amplitude
- Frequency determines color
- Amplitude determines brightness
Light and Sound Waves
- Light waves are created by electromagnetic fields working together
- There are two types of waves: mechanical and electromagnetic
- Sound, water, and seismic waves are mechanical waves
- Radio, microwave, and gamma waves are examples of EM waves
Wave Medium Density
- As the density of the medium increases, the speed of light decreases
- As the density of the medium increases, the speed of sound increases
Comparing Light and Sound Waves
- Sound: Amplitude is volume, longitudinal wave, human voice, speed increases with density
- Both: Are waves that carry energy from a source
- Light: Transverse wave, does not need a medium, amplitude is brightness, frequency is color, frequency changes with type of wave, speed decreases with density
Analog vs Digital Signals
- Analog: human voice, provides accurate sound representation, VHS/Record players, degrades over time
- Digital: Music from CD/DVD, can store more data, reliable for long distance travel
Vision
- The iris controls the size of the pupil to regulate light entry
- The lens focuses light onto the retina
- Cone cells in the retina are responsible for color vision
- Rod cells in the retina are responsible for vision in low light
Color
- White reflects all colors
- Black absorbs all colors
- Yellow objects reflect Red and Green colors, and absorbs Blue
- If blue light is on, and red and green are off, the object appears black or very dark
- If blue and green are off, but red is on, the object appears red
Optical System Parallels
- The cochlea relates to auditory nerve as retina relates to optical nerve
Refraction
- Oil refracts a pencil more than water
- Oil bends more than water
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