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7th Grade - Units 11 & 12 Sound & Light
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Why does light travel slower in water comared to air?
water is more dense / particles are more tightly packed
What is this?
prism
What is the law of reflection?
The angle of reflection is equal to the angle of incidence.
When light is blocked by an opaque object, this makes a ___.
shadow
Name the colours of the light spectrum in order (7 total).
red - orange - yellow - green - blue - indigo - violet (ROYGBIV)
When white light is split into a spectrum, this is called __.
dispersion
When light changes speed and bends, this is called ___.
refraction
How do we see the Moon?
light from Sun reflects off the Moon's surface
Red light + green light = ?
yellow light
Red light + blue light = ?
magenta light
Name the three secondary colors of light.
cyan, magenta, yellow
Name the three primary colors of light.
red, blue, green
If a green filter was used to shine light on a red book, what color would it appear?
black
Why does copper sulfate appear to be blue?
it reflects blue wavelength (and absorbs other colors)
Colored pieces of glass or plastic that absorb some wavelengths and transmit others are called __.
filters
Sound travels the fastest in a ___ medium.
solid
The greater the wavelength of a wave, the LOWER the ____.
pitch / frequency
TRUE or FALSE - Sound is carried by air which moves from the source to our ears.
FALSE
When air particles are close together in a vibration, this is called a ___.
compression
Sound cannot travel without __.
particles / air / matter / a medium
Which wave represents a louder sound - A or B?
B
The maximum distance the vibrating object moves from its rest position is called the __.
amplitude
Which wave has a higher pitch - A or B?
A
What is the unit for measuring frequency of a wave?
hertz = Hz = vibration per second
Bigger vibrations give ___ sounds.
louder
All sounds come from sources that ___.
vibrate
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