KS3 Waves – Light and Sound

Light Y7/8 Key Terms

Term

Definition

Reflection

When light bounces off surfaces. (On a mirror the angle it shines on the mirror and the angle it reflects are the same.)

Refraction

When light bends when it goes into a different material e.g. glass, water, air.

Dispersion

When white light separates into colours of the spectrum.

Spectrum

All the different colours. R, O, Y, G, B, I, V Three primary: green, red, blue. Secondary: green + red = yellow  OR green + blue = cyan OR red + blue = magenta

Mirror

A shiny surface which reflects light.

Triangular Prism

This makes light refract inside the prims and disperse in the air into a spectrum of colours

Virtual Image

Not real – i.e your face that appears inside a mirror behind the wall

Vacuum

Light does not need a medium to travel through

Transparent

Light can pass through a transparent sheet of glass

Opaque

Light cannot travel through a wall

Ray diagram

A model which uses ruled lines to show the pathway of travel, with arrows, connected up

Incident

Light going towards a surface

Reflected

Light going away from a surface (normally as the same angle it came it at)

Normal

Line at 90 degrees to a surface where you measure the angle from

Scattering

A rough surface scatters light in all directions so no image is formed

Filters

Act to filter out all the colours except that one.

Translucent

Allows some light to pass through but not enough to see detailed shapes

Eye Structure

Cornea, Pupil, Suspensory ligament, retina, focal point, iris, optic nerve, blind spot

EM Spectrum

Radio, Micro, IR, ROY-G-BIV, V, X-Ray, Gamma-Ray, (Cosmic)

Convex

Lens which is fat in the middle and gives a focal point. Common uses are magnifying glasses

Concave

Lens is skinny in the middle (or like a cave) makes the light spread out or disperse to form virtual images

Y7 Light Resources

Lesson 1 Transmission of Light

Lesson 2 Reflection “Theory”

Lesson 3 Reflection “Practical”

Lesson 4a How We See Colour

Lesson 4b Mixing Colours

Lesson 5 Colour Filters

Y8 Optics and Light Resources…

Lesson 1 Refraction in a Prism

Lesson 2a Dispersion

Lesson 2b Colour

Lesson 3 Lenses

Lesson 4 How We See

Lesson 5 Beyond Light “Hershel’s IR Exp

Interactive Quiz – Waves

Reflection and Refraction

This movie shows refraction, reflection, TIR with prisms.

Sound Resources…

This series of 4 lessons covers Y7 sound and how we hear.

Lesson 1: Vibrations and Waves

Lesson 2: Seeing Sound

Lesson 3: Speed of Sound

Lesson 4 How We Hear

Signal Generator and Oscilloscope

Oscilloscope and Signal Generator showing ideas of frequency and amplitude for Ks3-5 Pupils

Simulation

University of Vienna Simulation (PC version) to look at lenses for the more advanced view) lenses simulation

Permanent link to this article: https://www.animatedscience.co.uk/ks3-light-and-sound-2

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