Light & Sound Flashcards
how does light travel?
in straight lines
which of these is not a source of light? light bulb the sun a mirror a tv
a mirror
why are shadows formed?
light cannot go through some objects
which is faster, sound or light?
sound
how do we see things?
light from them enters our eyes
which type of object can transmit and absorb light?
opaque
which of these will absorb the most light? white glass black Orange
black
what is a plane mirror?
a flat mirror
what does transparent mean?
objects that light can easily pass through
what is refraction?
what happens when light bends as it goes from one substance into another
where does refraction take place?
as light travels from one opaque substance into another
why does refraction occur?
light reflects inside denser transparent materials
can a spectrum can only be made using paints?
no
which colour light is made up of many colours?
white light
what are the 3 primary colours for light?
red, green and blue
what colour does a red filter absorb?
Red light
why do blue objects look blue?
they reflect blue light
what causes sound?
vibrations
why does sound travel in air?
particles pass on vibrations
what is the pitch of a sound?
how high or low it sounds
what is frequency?
the number of waves per second
a loud sound is produced by waves with….
a large amplitude
what can sound travel through?
solids liquids and gases
which does sound travel through the quickest?
air
water
iron
space
