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UNIT 6: Sound and Light

ENERGY
It’s the ability to do work
Most of the energy on the Earth comes from the Sun
Energy cannot be created or destroyed, it can only be transformed.
TYPES OFENERGY
SOLAR ENERGY
It comes from the Sun
It can be transformed into heat and electricity
We do this with solar panels

THERMAL ENERGY
It comes from the motion/movement of particles in everyobject
Example: rubbing hands, geothermal energy

CHEMICAL ENERGY
It comes from atoms and molecules because they react
Example: biomass, petroleum, natural gas

MECHANICAL ENERGY
It comes fromobjects in motion
Example: wind energy, hydropower

ELECTRICAL ENERGY
It comes from electrons in motion
Example: power line
LIGHT
It’s a type of energy that can be seen by the human eye
Sources oflight can be _____ the sun
_____ man-made sources (a lamp)




PROPERTIES OF LIGHT
REFLECTION
Light reflects on surfaces.
It reflects in the samedirection when the surface is smooth; it reflects in different directions when the surface is rough.
REFRACTION
The light goes through the object.
Light bends when it passes through the water.
SPECTRUM:It’s a rainbow of colors that occurs when white light passes through a prism.
TO CONTROL AND DETECT LIGHT WE USE: a telescope, a camera, a microscope, binoculars, a magnifying glass or contactlenses
SOUND
It’s a form of energy
It’s produced when matter vibrates
Sound can be:
. LOUD: when we are close to the source
. QUIET: when we are far from the source
. HIGH: the vibrations are fast. LOW: the vibrations are slow

SOUND = NOISE

PLEASANT UNPLEASANT
SOUND SOUND


CHARACTERISTICS OF SOUND
PITCH- tells if the sound is high or lowDURATION- tells if a sound is short or long
INTENSITY – tells if a sound is loud or quiet
TIMBRE – allows us to distinguish one sound from another
UNIDAD 6: Luz y Sonido

ENERGÍA
• Es la capacidad...