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Science 8
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Created by
Michelle L
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Cards (129)
What is
sound
fundamentally based on?
Vibrations
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How can sound be visually represented?
Using
diagrams
shaped like mountains and valleys
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What are the two types of pitch in sound?
High-pitched
and
low-pitched
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What is necessary for sound to be generated by a loudspeaker?
The loudspeaker must move up and down
rapidly
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What happens to air molecules when a loudspeaker generates sound?
They are
forced
outwards
and
collide
with others
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What is the speed of sound in air?
340 meters per second
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How does the speed of sound in water compare to air?
Sound travels
faster
in water
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What type of wave is sound represented as in diagrams?
Transverse wave
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What does the frequency of a sound wave indicate?
The number of pulses
per second
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What is the unit of frequency?
Hertz
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What is the human hearing range in Hertz?
20 Hertz to
20,000
Hertz
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What is described as subsonic sound?
Sound below
20 Hertz
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What is described as supersonic sound?
Sound above
20,000
Hertz
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What device represents sound as a wave?
Oscilloscope
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What happens to the wave shape when frequency increases?
The wave shape changes and becomes
narrower
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What does a longer wavelength indicate about frequency?
Fewer
pulses
and lower frequency
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What does a shorter wavelength indicate about frequency?
More
pulses
and higher frequency
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What does the amplitude of a sound wave indicate?
The
loudness
of the sound
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What does a greater amplitude mean for sound?
A
louder
sound
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What does a lesser amplitude mean for sound?
A
softer
sound
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What would be beneficial if car and motorcycle exhausts could be used as fuel?
Both vehicles would benefit from a cycle
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What is the relationship between photosynthesis and cellular respiration?
Their
waste products
are used by each other
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What do living organisms need to eat to stay alive?
Food
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How do plants get their food?
Through the process of
photosynthesis
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What three items do plants need for photosynthesis?
Water,
carbon dioxide
, and sunlight
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What are
stomata?
Small
openings
on plant surfaces
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Where does photosynthesis occur in plants?
In the
chloroplasts
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What do plants create during photosynthesis?
Sugar in the form of
glucose
and oxygen
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How can photosynthesis be defined?
Process by which plants make food using
sunlight
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Why is cellular respiration important?
It generates
energy
for daily activities
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Where does cellular respiration take place?
In the
mitochondria
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What does the mitochondria do?
Acts as the
power plant
for cells
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What are the products of cellular respiration?
Carbon dioxide
, water, and
ATP
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How do photosynthesis and cellular respiration relate to each other?
They use each other's
waste products
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What is the cycle between photosynthesis and cellular respiration?
Photosynthesis uses carbon dioxide and water
Produces glucose and oxygen
Cellular respiration uses glucose and oxygen
Produces carbon dioxide, water, and
ATP
Cycle repeats continuously
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What is the chemical reaction in photosynthesis?
Carbon dioxide
plus water plus sunlight creates
glucose
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What is ATP?
Energy produced during
cellular respiration
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What is the role of sunlight in photosynthesis?
Provides energy for the
chemical reaction
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What do we breathe out that is used by plants?
Carbon dioxide
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How do plants contribute to the atmosphere?
By releasing oxygen during
photosynthesis
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