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Science Year 8 > Physics Year 8 > Flashcards

Physics Year 8 Flashcards

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Biology 101 flashcards
1
Q

Density

A

The amount of molecules in an area

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2
Q

Transverse waves

A

Waves that move up and down at 90 degree angle

Light is a transverse wave

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3
Q

Longitudinal wave

A

Waves that move back and forth

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4
Q

Wavelength

A

The distance between each crest

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5
Q

Crest

A

The top of a wave

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6
Q

Trough

A

The bottom of the wave

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7
Q

Equibilibrium

A

The line in the middle when drawing a wave diagram

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8
Q

Amplitude

A

The distance between the equilibrium and the crest or the distance between the equilibrium and the trough

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9
Q

What happens to light when it hits an object

A

It either reflects, absorbed or passes through

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10
Q

Transparent

A

When light passes through without being distorted

Examples are water and glass

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11
Q

Translucent

A

When some light passes through objects. The rest is reflected.
Examples are fogged glass and jelly

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12
Q

Opaque

A

This material does not allow light to pass through. The material absorbs the light or reflects the light.
Examples are wood and bricks

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13
Q

Ray

A

How light travels in a straight line

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14
Q

Incident ray

A

Light ray that travels towards a shiny surface

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15
Q

Reflected ray

A

The ray that is reflected from the shiny surface

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16
Q

Normal

A

The dotted line used to help draw a ray diagram

90 degrees

17
Q

Angle of incidence

A

The angle between the normal and ray of incidence

18
Q

Angle of reflection

A

The angle between the normal and ray of reflection

19
Q

Law of Reflection

A

The angle of incidence is equal to the angle of reflection

20
Q

Plane mirrors

A

These are flat mirrors

The image in the mirror is not magnified ut creates a virtual image

21
Q

Refraction

A

When light travels at different speeds in different mediums, the image through the substance looks disjointed. It is the bending of light rays and this occurs when light travels from one medium to another with different densities.

22
Q

What happens when light rays travel into a denser medium

A

The ray bends towards the normal because it becomes slower due to the amount of particles.

23
Q

What happens when a light ray travels into a medium that is less dense

A

It bends away from the normal and travels faster.

24
Q

Refracted ray

A

The ray that passes through the new medium

25
Q

Lowest possible refractive index

A

Vacuum of 1

26
Q

A high refractive index

A

Diamonds of 2.42

27
Q

Refractive Index

A

The number that measures the density of a material

28
Q

Prism

A

A triangular object that bends light to form the colours of the rainbow. It is translucent.

29
Q

Dispersion

A

Separation of white light according to the colours with different wavelength

Science Year 8 (7 decks)

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