Science- Light, Heat, Sound, Colour

Front 1

What are the types of waves?

Back 1

Transverse waves- the direction of the particle/disturbance is at right angle to the direction of energy transfer

Longitudinal waves- The direction of the particle is parallel to the direction of energy transfer

Front 2

What is light an example of?

Back 2

Electromagnetic waves

Front 3

How does light travel?

Back 3

It travels in waves in straight lines

Front 4

What is the law of reflection?

Back 4

angle of incidence=angle of reflection

Front 5

What is the speed of light

Back 5

c=3x10^8ms^-1

Front 6

What is: transparent, translucent, opaque

Back 6

-light can be passed through surface and image can be seen easily on the other side.
-some particles of light pass through, showing image to be distorted on the other side of surface
-light is absorbed and cannot be seen through on the other side

Front 7

Refraction

Back 7

The bending of light when it passes through materials that have a different speed of light.

Front 8

Lens shape

Back 8

convex- converge

concave- diverge

Front 9

what are converging and diverging lenses

Back 9

light rays are reflected towards each other to meet at the focal point

light rays are reflected away from each other. There is no focal point when a lens light ray diverges so they have a virtual focal point. Measured by tracing back the rays.

Front 10

Mirrors: concave and cenvex and there effect with light

Back 10

Follow the law of reflection. The parallel light rays are reflected to a focal point.

Front 11

applications of absorption, refraction and reflection

Back 11

refraction: glasses, objects in water seen from outside of water, binoculars, magnifying glass, telescopes

reflection: makeup mirror, mirror telescope,

absorption: of colours

Front 12

dispersion used in everyday occurrences

Back 12

rainbows. Seeing certain colours caused because when light appears on an opaque surface, all the colours are absorbed except for the colour of the surface which is reflected.

Front 13

What is conduction

Back 13

occurs in solids, liquids and gases. Heat from source move slowly to object because particles from heat source will move fast from the kinetic energy, making the next particle heat and so on, causing the whole object to heat up

heating a pot from a flame on stove

Front 14

What is convection?

Back 14

the movement caused within a fluid when heated the particles gain heat energy and warm less dense air rises. The particles looks heat energy and that cold denser air sinks.

eg. boiling water

Front 15

What is radiation?

Back 15

Requires no particles.

Heat that is transferred by radiation is actually heat that is in the form of electromagnetic waves. This is called infrared.

eg. sun is a source of radiated heat.

Front 16

How does sounds start?

Back 16

Sound starts with vibration and the movement is up and down. eg. when diver jumps in unsettled water, water vibrates and you can see the transmitted energy in waves.

Sound waves needs particles to travel

Front 17

How does sound energy travel?

Back 17

longitudinal waves. rarefactions is low pressure

Front 18

what is frequency

Back 18

number of waves per second. measured in Hz

Front 19

wave speed is

Back 19

v

v=frequency x wavelength