Physics Light Unit Test Flashcards
(25 cards)
What is bioluminescence?
Light from living things.
Examples include fireflies and certain types of jellyfish.
What is fluorescence?
Light emitted immediately after absorbing light.
Common in fluorescent lights.
What is phosphorescence?
Light emitted slowly after absorbing light.
Often seen in glow-in-the-dark materials.
Why do organisms use bioluminescence?
To attract prey, communicate, and defend.
It can scare off predators as well.
What are the downsides of incandescent bulbs?
Waste energy (mostly heat) and have a short lifespan.
They are less energy-efficient compared to LED bulbs.
Define light.
Electromagnetic radiation we can see.
It is a form of energy that travels in waves.
What is the electromagnetic spectrum?
The range of all types of electromagnetic radiation.
Includes radio waves, microwaves, infrared, visible light, ultraviolet, X-rays, and gamma rays.
How is energy related to wavelength?
Short wavelength = high energy; Long wavelength = low energy.
This relationship is crucial in understanding electromagnetic radiation.
List the order of the electromagnetic spectrum from low to high energy.
- Radio
- Microwave
- Infrared
- Visible
- Ultraviolet
- X-ray
- Gamma
Which parts of the electromagnetic spectrum are more dangerous?
UV, X-ray, Gamma.
These can cause damage to living tissues.
What are the colors of the visible spectrum?
ROYGBIV (Red, Orange, Yellow, Green, Blue, Indigo, Violet).
This represents the colors visible to the human eye.
What is refraction?
The bending of light as it passes from one medium to another.
It occurs due to changes in light speed.
What does a prism do?
Splits light into colors by bending.
This is how rainbows can be created with light.
Define luminous objects.
Objects that make their own light (e.g., Sun, bulb).
They emit light without needing to reflect it.
Define nonluminous objects.
Objects that reflect light (e.g., Moon, table).
They do not produce their own light.
What is the relationship between the incident ray, reflected ray, and angles at a plane mirror?
Angle of incidence = angle of reflection.
The normal is the line perpendicular to the mirror at the point of incidence.
What are the types of mirrors?
- Concave: Curves inward (converging)
- Convex: Curves outward (diverging)
What does SALT stand for in image characteristics?
- Size
- Attitude (upright or inverted)
- Location
- Type (real or virtual)
What is the angle of refraction?
The angle at which light bends when entering a new medium.
This angle varies depending on the materials involved.
What is the index of refraction?
How much light bends in a material.
It is a dimensionless number that describes how fast light travels in a medium.
What is the speed of light?
About 300,000 km/s.
This is considered the universal speed limit.
True or False: Nothing can exceed the speed of light.
True.
This principle is a cornerstone of modern physics.
What are the main branches of a mind map on the nature of light?
- Nature of Light
- EM Spectrum
- Reflection
- Refraction
What should be included in the sub-branches of a mind map?
- Key terms
- Examples
- Diagrams
