Physics Unit Flashcards
(34 cards)
What are the different visible light spectrum through a prism?
- Red = highest wavelength
- Orange
- Yellow
- Green
- Blue
- Indigo
- Violet = shortest wavelength
When a frequency changes, what happened to the size of its wave?
- The wave gets larger through smaller frequency and
smaller through higher frequencies
What does the particle model of light state?
• The particle model of light explains how light has
particle-like properties
- The photoelectric effect could not be explained by
the wave model of light
–> When light or a high enough frequency shines on a
metal surface, electrons are given off.
How does light behave when it encounters different materials and surfaces?
• Light behaves in different ways when it comes into
contact with different materials. It can be:
- Reflected
- Absorbed
- Transmitted
- Refracted
What is absorption?
• Absorption –> When light energy is trapped in an
object as heat
What is transmittion?
• Transmitting –> Light passes through a material
- Different materials transmit different amount of light
- The speed of light can change in different materials
What is refraction?
• Refraction –> When light rays go through a object and
change direction
What are lenses?
• Lenses - Transparent objects with at least one curved
surface that change direction of light rays.
- 2 types of lenses
1. Convex lens –> Curved out, thicker in the center
- Used to correct long sighted eyes
2. Concave lens –> Curved in, thinner in the center.
- Used to correct short sighted eyes
What are the three classifications of reflection?
• The three classifications of reflections:
- Transparent - light goes through
- Translucent - light is scattered
- Opaque - light is bocked
What is reflection?
• Reflection - process when light bounces off a surface
and changes direction
- Two types of reflection:
1. Reflection of a rough surface
2. Reflection off a smooth surfaceHow does a smooth surface reflect light?
• When a smooth surface reflects light, the pattern of
reflected rays is similar to the pattern of incoming rays
- This lets you see an image when light reacts with your
eye
What is the law of reflection?
• The law of reflection: angle of incident ray = angle of
reflected ray
What are concave and convex mirrors?
• Concave mirror: A mirror with a reflective surface
curves inward
- E.g: Mirrors in shopping stores, car side mirrors
• Convex mirror: A mirror with a reflective surface that
caves outward
- E.g.: Car headlights, camera flashes
What are properties of electromagnetic radiation:
• Properties of electromagnetic radiation:
- Invisible as it travels
- Involves the transfer of energy from one place or
another
- Can travel through empty space at the speed of light
- Has both electric and magnetic energy
What are the different types of electromagnetic radiation?
• The seven types of electromagnetic radiation include: - radio waves - microscope - infrared - visible light - ultraviolet radiation - x-ray - gamma-ray • The seven forms of electromagnetic radiation only differ in frequency, wavelengths, energy
What models are used to describe the behavior of electromagnetic radiation?
• The three models used to describe the behavior of
light include:
1. The ray model - Light travels in straight lines
2. The wave model - Light is a wave of
electromagnetic energy
3. The particle model - Light is made up of tiny
particles of packets of energy called “photons”
Who discovered light travels in straight lines?
• Euchlid suggested that light travels in straight lines
What is a “ray?”
• Ray: An arrow that is used to show the straight path of l
light
- Ray diagrams:
–> Used to study and predict how light behaved by
representing the direction of travel of light rays
using arrows.
• Rays are blocked by opaque objects cause shadows
• The distance between an object and light source affects
the size of the window
What is the wave model of light?
• The wave model of Light explains that Light has wave-
like properties
- Thomas young preformed a idea that light has the
properties of a wave.
What is the Sclera?
• Sclera: The white outer layer that protects and supports
the eye
What is the Limbus?
• Limbus: The junction between the sclera and the
cornea
What is the Ciliary body?
• Ciliary body: Consists of the ciliary muscles, ligaments
that attach to the lens and the ciliary ring which conects
to the choroid
What is the Choroid?
• Choroid: A dark layer between the sclera and retina
containing blood vessels to provide nutrients and
remove waste.
What is the Anterior chamber?
• Anterior chamber: The space between the cornea and
the iris - it holds a fluid called the aqueous humour
