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Science Flashcards
Light, types of waves, fluency and wavelength, mirrors and reflecting
30
Science
9th Grade
02/17/2014

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Cards

Term
Vacuum
Definition

A vacuum is where there is no particles.

space is an example of a vacuum.

Term
Mechanical Waves
Definition

Types of mechanical waves include water and sound waves. 

These types of waves cannot pass through a vacuum.

Term
Electromagnetic waves
Definition

Types of electromagnetic waves include light and heat waves.

Electromagnetic waves can pass through a vacuum.

Term
Frequency
Definition
Is the number of crests that pass a given point in one second.
Term
Wavelength
Definition

Wavelength is the distance between the crests of the wave.

The smaller the wavelength the more energy there is.

Term
Crests and Troughs
Definition
[image]
Term
Luminous
Definition

Luminous objects produce their own light.

An example of a luminous object is the sun.

Term
Light
Definition

Light can travel as an electromagnetic wave that can be seen by humans.

Light can travel through a vacuum.

The frequency and wavelengh of different light determines how we see colour.

Term
Beam
Definition
Many light rays travelling together.
Term
Transparent
Definition
If light rays travel through a substance and you can clearly see through it.
Term
Translucent
Definition
If light rays travel through a substance but you cannot clearly see through it.
Term
Opaque
Definition
If light rays do not travel through a substance.
Term
Reflection
Definition

Smooth shiny objects are able to produce an image of nearby objects. 

 

Term
Properties of Light
Definition

1. Light travels in straight lines.

2. Light travels much faster than sound

3. We see things because they reflect light into our eyes

Term
Shadows
Definition
Shadows are places where light is blocked.
Term
Regular Reflection
Definition
Regular Reflection is where light hits a flat shiny surface and bounces back parallel to the other rays.
Term
Diffuse Reflection
Definition
Diffuse Reflection is where light hits an uneven surface and bounces back in an irregular way.
Term
Law of Reflection
Definition

1. When light strikes a mirror, the reflected ray bounces off the mirror at the same angle as it strikes the mirror.

2. The angle of incidence is always equal to the angle of reflection no matter how the light strikes the surface.

Term
Incident Ray
Definition
The incident ray is the light ray that comes towards the surface.
Term
Angle of incidence
Definition
The angle between the normal and incident ray.
Term
Reflected Ray
Definition
The reflected ray is the outgoing ray from the surface.
Term
Angle of Reflection
Definition
The angle between the normal and reflected ray.
Term
Normal Ray
Definition
The normal ray is the ray between the incident and reflected ray.
Term
Concave Mirror
Definition

A concave mirror is a mirror that is curved inwards.

In a concave mirror the object appears smaller.

Term
Focal Point
Definition
The point where two or more beams of light meet.
Term
Converging
Definition
When light reflects inwards.
Term
Convex
Definition

A mirror that curves outwards.

In a convex mirror the object appears bigger.

Term
Diverging
Definition
Where light is reflected out from a convex mirror.
Term
Refraction
Definition

The bending of light is called refraction.

Refraction occurs because as light travels through materials of different density its speed changes slightly.

 

Term
Refraction 2
Definition

The only time refraction doesnt occur is when light hits at exactly 90 degrees.

When light travels from a less dense to a more dense substance it bends towards normal.

When light travels from a more dense to a less dense substance it moves away from normal.

The smaller the angle the more dense the substance is.

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