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
