Brainscape's Knowledge GenomeTM

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


See full index

Science 8-finals > Physics > Flashcards

Physics Flashcards

You may prefer our related Brainscape-certified flashcards:
Biology 101 flashcards
1
Q

What is electromagnetic radiation

A

It consists of energy travelling in the form of waves through space that radiate from energy sources

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

What are photons

A

-Energy particles.
- All photons travel at the speed of light and oscillate (make a wave).
-has energy and movement but do not have mass or charge

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

What is the EMR

A

-The energy travelling in the form of waves thru space that radiates from an energy source
-basically a stream of photons

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

What the the EMR spectrum from the longest wavelengths to the shortest wavelengths

A

Radio waves, microwave, infrared radiation, visible light, ultraviolet, x-ray, gamma ray
(RMI VUXG)

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

What colours have the longest wavelength and shortest

A

-Red has the lowest amount of energy associated with it
-longest wavelength

-purple has the greatest amount of energy associated with it
-shortest wavelength

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

What is a wave

A

-A disturbance or movement that transfers
energy thru space or matter
-is the top of one wave to another wave (horizontal)

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

What is an amplitude

A

The distance between the crest and rest position or the trough and rest position (vertical)

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

What is the frequency, how do u calculate it

A

-The number or cycles that occurs in a given time (Hz)
-to find the frequency divide:
Frequency=the number of occurrences / time interval

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

What is the trough and crest

A

The trough is the bottom of a wave
The crest is the top of the wave

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

What is the ray model of light

A

-states that light rays travel in a straight line and cannot bend around objects
-can be used to predict size, location, and shape of shadows

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

What are the types of waves (2)

A

Transverse waves:moves up and down perpendicular to the direction of the wave

Longitudinal wave: moves forward and backward along the same direction of the wave

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

What is the wave model of light

A

Explains how light behaves as a wave

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

What is the particle model of light

A

Explains the photoelectric effect:
-different colours of light shine onto certain metals
-red light cannot detach electrons when hitting metal
-blue light always detached electrons when hitting metal
(Suggested by Albert Einstein)

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

What is reflection

A

Light bounces off

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

What is absorption

A

Light is trapped as heat

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

What is Transmission

A

Light passes through at different levels

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

What is refraction

A

Light bends as it passes from one medium to another

18
Q

What are the types of materials. Explain

A

Transparent: all or most of light is transmitted. Only a small amount is scattered

Opaque: all or most of light is relected or absorbed. No light passes thru

Translucent: only some light is transmitted and the light is scattered in all directions

19
Q

What are the laws of reflection

A
  1. The angle of reflection = the angle of incidence <r=<i
    2.the incident ray and reflected ray are on the opposite sides of the normal
  2. The incident ray, the Normal, and the reflected ray lie on the same plane
20
Q

What are the characteristics of a plane mirror

A
  • smooth flat reflective surface
    -nearly identical to the object
21
Q

What are the characteristics of a concave mirror

A

-object is far away from the focal point: closer, smaller, inverted, real

-object is close to the focal point: farther, larger, inverted, real

-object is in front of focal point: father, larger, upright, virtual

-curves inward

-converges light rays

22
Q

What does virtual, and real mean

A

Virtual: extended rays meet behind mirror; image appears to be behind the mirror

Real: light rays meet in front of mirror; image appears to be in front of mirror

23
Q

What are the characteristics of a convex mirror

A

-curves outward

-always produces an image closer, smaller, upright, virtual

24
Q

What is a lens

A

A transparent object that causes light to refract and has at least one curved side

25
Q

What is converging And diverging

A

Converging: bring parallel light rays toward a common
point

Diverging: spread away parallel light rays

26
Q

How is a rainbow formed

A

White light from the sun enters a raindrop and refracts then it reflects off the back of the ring drop and refracts again as exit the EMR spectrum has different wavelengths and each reflects a different angle so the spectrum is separated, in order producing a rainbow

27
Q

How is a mirage formed

A

When the air is cool, and the ground is hot, layers of air appear when light rays travel from the cool air to the hot ground that bends in a U-shaped, different air masses, collide together and act as a mirror so when the light rays reaches our eyes, we can see reflections of things

28
Q

What is the pupil

A

Where are the light enters your eye

29
Q

What is the iris?

A

Coloured circle, control how much light gets into your eye

30
Q

What is the cornea?

A

Transparent tissuee

31
Q

What is the ciliary muscle?

A

They control the shape of the lens to adjust for near and far objects

32
Q

What is the retina

A

Convex lens images are formed

33
Q

What are the fiber and cells

A

Convert light to our brain-optic nerves

34
Q

What is the vitreous humor

A

Jelly fluid

35
Q

What is hyperopia

A

-farsightedness (can only see far)
-eyeball is too short or the cornea does not curve as much
-the light does not refract enough so the light is focused behind the retina instead of on it

36
Q

What is myopia

A

-nearsightedness (can only see close)
-The eyeball is too long were the cornea is too curve, so the light is refracted too much for the light focusses in front of the retina instead of directly on it

37
Q

What kind of lens is glasses/contacts

A

Diverging lens

38
Q

What are Cataracts

A

Cloudy and/or loss of vision due to proteins buildup in the lens of your eye as you grow older

39
Q

How can you treat Cataracts?

A

Surgery

40
Q

What is astigmatism?

A

-blurry at all distances
-Cornea has a elongated shape and light focuses on multiple points

41
Q

How is refraction related to density?

A

-The angle of refraction is related to the density of the medium
-refraction is related to density because the speed of light changes when it passes from one medium to another with different density

42
Q

What is the sclera

A

The white layer of the eye that covers most of the outside of the eyeball

Science 8-finals (3 decks)

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