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science Flashcards

1
Q

compare and contrast longitudinal and transverse waves.

A

transverse waves move the medium at right angles to the direction in which the waves move while longitudinal waves move parallel to the direction in which the waves move.

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2
Q

list 3 renewable and non-renewable sources

A

*Solar energy
wind energy
hydropower energy
*Fossil fuel
coal
natural gas

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3
Q

continental drift

A

The gradual movement of the continents across the earth’s surface through geological time.

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4
Q

wavelength

A

distance from crest to crest to trough to trough.

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5
Q

frequency

A

the number of complete waves that pass a certain point in a certain amount of time.

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6
Q

what does an electric circuit need

A
  • wires
    *source of electrical energy
  • a component
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7
Q

what is voltage

A

pressure from an electrical circuit’s power source that pushes charged electrons through a conducting loop.

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8
Q

current meaning

A

flow of electrons through a complete circuit of conductors (it is used to power everything)

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9
Q

resistance meaning

A

measure of opposition to current flow in an electrical circuit

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10
Q

difference between series and parallel circuits

A

series is not common in homes while parallel are and series is unreliable wiring method while parallel is

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11
Q

3 circuits

A

wire, light and globe

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12
Q

3 conductors

A

silver gold and steel

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13
Q

law of conservation of energy

A

when energy is transferred from place to place or transformed from one type of energy to another, the total amount of energy remains the same. Therefore, energy cannot be created or destroyed, but can only change places or forms

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14
Q

what does efficiency allow us to do

A

compare how much waste energy and useful energy is produced

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15
Q

how do you calculate efficiency

A

efficiency=useful energy/ total energy x 100 (always in a percentage)

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16
Q

how does heat transfer occur

A

conduction, convection or radiation

17
Q

conduction meaning

A

only occurs between objects that are in direct contact

18
Q

convection meaning

A

the transfer of heat between 2 bodies by currents of moving gas or fluid.

19
Q

radiation meaning

A

a process where heat waves are emitted that may be absorbed, reflected or transmitted through a colder body

20
Q

light

A

can be transmitted, absorbed or reflected

21
Q

transparent

A

allows light to pass through without being transmitted.

22
Q

translucent

A

allows some light to pass through, rest of the light is reflected

23
Q

opaque

A

do not allow any light to pass through, it absorbs the light.

24
Q

refraction

A

bending of light as it travels into a medium with different density

25
Q

where do tectonic plates interact

A

due to convection currents in the mantle

26
Q

how do tectonic plates interact

A
  1. move away from each other (divergent)
  2. move towards each other (convergent)
  3. slide past each other (transform)
27
Q

what is Pangea

A

Pangea also spelled Pangaea, in early geologic time, a supercontinent that incorporated almost all the landmasses on Earth.

28
Q

what is high frequency

A

when the waves are close to each other

28
Q

how does the magma keep moving

A

convection currents in the mantle keep the magma moving.

29
Q

what are waves

A

disturbances that transfer energy from place to place

29
Q

what do waves require

A

a medium to travel on or through

30
Q

do waves move matter

A

no waves move energy

31
Q

anatomy of a wave

A

amplitude- how high the wave is from the center
crest- the top of the wave

32
Q

how do the movement of earths plate move

A

they move because of convection currents in the mantle

33
Q

what energy does a radio need

A

Electromagnetic energy travels in waves and spans a broad spectrum from very long radio waves to very short gamma rays

34
Q

how are tsunamis created and caused, what are the effects and how can it be minimized

A

A tsunami is a catastrophic ocean wave that is usually caused by a submarine earthquake, an underwater or coastal landslide, or the eruption of a volcano. Unusually strong currents and Rapid flooding of land. Dense mangrove habitats can be used to reduce the force of waves and reduce the pressure.
Coral reefs may be artificially constructed.

35
Q

how are earthquakes created and caused, what are the effects and how can it be minimized

A

As plates move in different directions over long periods of time, the .friction causes energy to build up. It becomes so great that the energy is released, which creates a shock wave - an earthquake. Ground shaking Surface faulting and Ground failure. Seismic isolation
Seismic energy dissipation systems

BFC (6 decks)

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