Electromagnetic Test Flashcards
How was the speed of light determined? What is one of the issues of measuring the speed of light?
The big issue with measuring the speed of light is that it moves so fast. Because of this mirrors were used to increase the distance that the light had to travel making it easier to measure.
What three properties of a wave are different between red light and blue light.
Wavelength, Frequency, Energy
All electromagnetic waves have the same speed, and reflecting properties.
What two things do you need to know about a wave in order to calculate its frequency?
The waves speed, and its wavelength.
Isaac Newton hypothesized that light was a stream of particles because…
It travels in a straight line and casts a shadow.
Unrelated to the test light can also travel through a vacuum.
What two things does an electromagnetic wave behave like?
A wave and a particle.
Why does light get dimmer as it moves away from its source?
The photons are spread out over a larger area.
How do photons travel from a light source?
In all directions.
Although once released light travels in a straight line.
Infrared rays are between what two other parts of the electromagnetic spectrum?
Microwaves and visible light. (The test mentions radar)
The waves with the longest frequencies in the electromagnetic spectrum are the…
Radio waves
The full range of frequencies of electromagnetic waves is the …
Electromagnetic spectrum
X-ray photographs show softer tissue as…
Dark highly exposed areas.
This is because the x-rays pass through the softer material and are blocked by the dense material.
Visible light lies between what two areas of the electromagnetic spectrum?
micro waves and ultraviolet waves
What does a translucent material do…
Scatters some, but not all of the light.
Order the light transmitting properties of materials from all light to no light.
Opaque, Translucent, Transparent
Transparent, Translucent, Opaque
What is the term for when light changes direction when it passes from one medium to another?
Refraction
How do polarized sunglasses work?
It blocks the light that vibrates in certain planes.
What did Newton’s prism experiment discover?
That visible light was made up of all the colors.
What is the name of the process hat creates a rainbow from raindrops?
Dispersion
The raindrops act as a prism.
What determines the color of an object?
What it is made of and the color of light that hits it.
Blue light and yellow light combine to form white light because they are…
Complimentary colors of light.
The primary colors of light are…
Red, Blue, Green
An incandescent bulb produces light when the electrons flow through the…
Filament
The filament is usually a metal that heats up when the electrons flow through.
Why do neon lights glow red.
The red color comes from the electron configuration of Neon.
The color of the glass tubing does not make the light red.
Light whose waves all have the same wavelength frequency and coincidental peaks is…
Coherent
Lasers produce coherent light.
What gas is inside a fluorescent light?
Mercury
