Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

GRADE 8 FLASHCARDS > sci a > Flashcards

sci a Flashcards

1
Q

is defined as the transfer of
energy from a vibrating object in waves
that travel through matter.

A

Sound

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

All sound waves begin with ______?

A

vibrating
matter

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

You’ll often see the speed of sound given as

A

343 meters per second

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

speed of sound under a
certain set of conditions, specifically, through _____

A

dry air at 20 °C

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

The speed of sound may be very different
through other matter or at other temperatures.

A

True

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

The speed of sound does not depend on the temperature of the medium.

A

False

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

sound has a slower speed at _______?

A

Lower temperatures

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

At a lower temperature, particles of the medium are moving more

A

slower

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

At a lower temperature, particles of the medium are moving more

A

slower

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

is a sound that is repeated
because the sound waves ae reflected
back.

A

echo

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Although the direction of the sound
changes, the echo sounds the same as
the original sound.

A

True

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

is helpful for
exploring and mapping
the ocean because
sound waves travel
farther in the water
than do radar and light
waves.

A

Sonar

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

 Scientists primarily use ___ to develop nautical charts,
locate underwater hazards to navigation, search for and
map objects on the seafloor such as shipwrecks, and map
the seafloor itself.

A

sonar

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

light with the longest wavelength appears red,
and light with the shortest wavelength appears violet.

A
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

________ is light that has wavelengths that can be detected by
the human eye.

A

Visible light

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

The ________of visible light determines the color that the light
appears.

A

Wavelength

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

light with the longest wavelength appears red,
and light with the shortest wavelength appears violet.

A

Red, violet

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

A ____ can be used to separate visible light into
its different colors.

A

Prism

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

The process by which light is separated into its
colors due to differences in degrees of refraction
is called ________

A

Dispersion

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

An _______ object is one that doesn’t let light pass
through it. Instead, it reflects or absorbs the light that
strikes it.

A

Opaque

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

A __________________, such as
window glass, transmits some or all of the light
that strikes it.

A

Transparents or Translucent material

21
Q

The human eye can distinguish
only _____________?

A

red, green and blue light

22
Q

__________________- are
called the secondary colors of
light.

A

Yellow magenta cyan

23
Q

__________ is a substance that colors materials by reflecting
light of certain wavelengths and absorbing light of other
wavelengths.

A

Pigment

24
Q

White light is composed of ——————–. Your eye
blends the colors and your brain “sees”
white light.

A

an infinite
number of individual colors

25
Q

White light is composed of ——————–. Your eye
blends the colors and your brain “sees”
white light.

A

an infinite
number of individual colors

26
Q

is when waves, whether physical or
electromagnetic, bounce from a surface back toward
the source.

A

Reflection

27
Q

is when waves, whether physical or
electromagnetic, bounce from a surface back toward
the source.

A

Reflection

28
Q

is when waves, whether physical or
electromagnetic, are deflected when the waves go
through a substance.

A

Refraction

29
Q

is also described as bending of light
as it passed from one transparent medium into
another.

A

Refraction

30
Q

is an atmospheric discharge which usually occurs during
a rain storm.

A

Lightning

31
Q

is the audible energy discharge from a
lightning flash.

A

Thunderclap

32
Q

also known as the apparent temperature, is what the temperature feels like to the human body when relative humidity is combined with the air temperature.

A

The heat index

33
Q

involves a
change of phase from solid
to gas.

A

Sublimation

34
Q

is when a
substance goes from gas to
solid.

A

Deposition

35
Q

is the process
by which water vapor
changes to liquid.

A

Condensation

36
Q

is the change of
liquid into water vapor.

A

Evaporation

37
Q

Two types of Force?

A

Balanced and unbalanced forces

38
Q

is a phase change
where is solid is converted to
liquid by the application of
heat.

A

Melting

39
Q

is a phase of change
from liquid to solid.

A

Freezing

40
Q

Acceleration is directly proportional to _________

A

Net external force

41
Q

opposition to the flow of electric charges that
occurs when electric current travels through matter.

A

RESISTANCE

42
Q

materials that have low resistance
to electric current

A

Conductors

43
Q

materials that have high resistance
to electric current

A

Insulators

44
Q
  • A longer wire has _____ resistance.
A

more

45
Q
  • A shorter wire has _____ resistance.
A

less

46
Q

A cooler wire has ___resistance
than a warmer wire.

A

less

47
Q

The SI unit for both work and energy is
________?

A

joule (J), or Newton ot meter (N ∙ m).

48
Q

___ joule is the amount of energy
needed to apply a force of 1 Newton
over a distance of 1 meter.

A

1

49
Q

Kinetic energy is the energy of
_____?

A

moving matter

GRADE 8 FLASHCARDS (3 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions