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electromagnetic waves Flashcards

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1
Q

what is a bi concave lense also known as

A

divering lens

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2
Q

what is a bi convex also know as

A

converging lens

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3
Q

what is a biconcave lens

A

makes parrel light rays diverge

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4
Q

what does converge mean

A

come together

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5
Q

what does diverge mean

A

spread out

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6
Q

what is a bi convex lens

A

makes parallel light rays converge

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7
Q

what is the focal length

A

the distnace betweem the focal point and the centre of the lens

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8
Q

what is the focal point

A

the point as which light tays converge after passing through a lens

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9
Q

what is power

A

a measure of how much a lens refracts light that passes through it

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10
Q

what is convering lens

A

a lens that s fatter in the middle than at the edges

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11
Q

what is divering lens

A

a lens that is thinner in the middle than at its edges

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12
Q

What is a real image

A

is an image that can be projected onto another surface

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13
Q

what type of lens can be used to create a real image

A

biconvex

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14
Q

can real images be projected onto a screen

A

yes

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15
Q

can virtual images be projected

A

onto a screen

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16
Q

what do divering lenses prouduce

A

virtual images

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17
Q

when you use a magnifying glass how do images appear

A

The image appears to be on the same side of the lens as
the object, is upright and magnified.

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18
Q

what do lens diagrams tell us about an image

A

a)Real /virtual
b)Magnified/ diminished/ same size
c)Inverted/ upright

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19
Q

what kind of animals can see ultraviolet light

A

bees and insect,it helps guide them to see pollen

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20
Q

are ultra violent waves short or long

A

short for our eyes to detect

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21
Q

what are elctromagnectic waves

A

transverdsde waves that travel at the speed of light in a vaccu, and transfer energy but not matter

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22
Q

what are three examples of electromagnetic waves

A
  • ultgra violent
  • infrared
  • visbale light
23
Q

what is a vaccum

A

empty space or a space with no air particles

24
Q

any objectt that is warm emits..

A

infra red waves

25
Q

anything where the frequency are too high to detect are what kind of electromagnetic waves

A

ultraviolet

26
Q

anything where the frequency is too low to detect are what kind of electromagnetic waves

A

infrared

27
Q

do radio waves have low or high frequency

A

low frequency,low wave length and low danger

28
Q

how do we detect lenses

A

x ray telescope

29
Q

how are mucro waves used

A
  • communication and satellite transmissions
  • micro waves are the way we communicate with phones
  • transfer energy to water molecules to heat it from the inside
  • communicate at very long distances because the wave is travelling to a staillite and then being re transmitted
30
Q

how are radio waves used

A
  • transmitting radio broadcastin
  • communicate with space craft
  • refracted by ionsphere
  • long range commuication
31
Q

how are infra red used

A
  • communicate at short ranges
  • transfer energy to food
  • detect heat through night vision and security cameras
32
Q

how is visble light used

A
  • record images in cameras
  • light reflects of surfaces
  • capture light
33
Q

what is an example where visble loight is used

A
  • camera
  • light blub
34
Q

what is an example of radio waves

A
  • satillates
  • controllers
35
Q

what is an exomple where infra red is used

A
  • compuiters
  • tv
  • grill
36
Q

explain how radio waves and microwaves are used for long communication

A

radio waves are refracted ionosphere which allows them to overcome the curvature of the earth traveling at long distances. microwaves are transmitted through the ionosphere and are received by satellites and the satellites then retransmits this to a receiver

37
Q

ionosphere

A

is charged layer around the atmosphere

38
Q

name three short em waves

A

ultra violet,x rays , gamma rays

39
Q

what are the use of x rays

A
  • are used in medical scanning ( to see broken bones )
  • can pass through skin muscles and fat
    -0- can’t pass through bones
  • bones absorb the xrays because they are dense
  • the brighter the white is on the x-ray is the denser it is
  • used in airports to scan luggage
  • it is used for security scans in airports and metals are dense matriels so they absorb the x ray
    -can use to detect leaks or broken pipes
  • the x-ray can pass through the break in the pipe, this is when the pipe is of dense material , good way to identify where a break in a pipe is
40
Q

what are the use of ultra violet waves

A
  • we can’t see it
  • if we had a lamp, you won’t be able to see if the lamp breaks,
  • if you had a banknote, you can use ultraviolet light to see if it is real or not and the uc is absorbing the ink and then emits visible
  • can kill cells
    in water treatment, all the water that Is clean goes through a machine where that shine ultraviolet light it to kill the bacteria and this stops diseases from passing
41
Q

what are the use of gamma rays ?

is it high frequency or low frequency ?

what happens when are exposed to massive amounts of radiation

what happens when we are sterlizing medical equipment

what happens when you are buying fresh fruit ?

how do hospitals use gamma rays to treat patients ?

A
  • high frequency
  • gamma rays transfer more amount of wavelength because of their high frequency
  • transfer huge amounts of energy
  • when we are exposed to massive amounts of radiation, we die
  • we can use gamma radiation to sterilize medical equipment
  • when they sterilize them, they put them in a machine and because the gamma rays are powerful, anything that is alive
    will be killed like bacteria and human cells
  • when you buy fresh fruit from the supermarket, on a convey belt it is blasted with gamma rays and it helps to kill any bacteria on that bacteria and stops it from going off as quickly . It extends their shelf-life
  • we use gamma rays for treating and diagnosing patients
  • in hospitals, they use gamma electromagnetic waves and this is when a patient is diagnosed with having a tumor for example cancer
  • gamma rays can be used to diagnose tumors and to treat them
42
Q

how can infra red waves be dangerous

A

can cause burns to skin

43
Q

what is the realtionship between frequency and danger

A

the greater the frequency , the hreater the energy transferred by a wave. highfrequency waves are ionsing

44
Q

name the non ionsing electro magnetic waves

A

radio waves,microwaves,infrared,visble light

45
Q

name the ionsing waves

A

ultraviolet,xray,gamma rays

46
Q

what part of the body absorbs ultra vioet

A

skin

47
Q

what is the effect of ultravilet

A
  • damages skin cells
  • cause mutation in dna
  • can lead to skin cancer
48
Q

what part of the body absorb x rays

A

bones

49
Q

what is the effect of x rays

A
  • cause mutation in dna
  • can lead to bone cancer
50
Q

what is the effect of gamma rays

A
  • ## kill cells
51
Q

what is the effect of visbile light

A

temporary blindless

52
Q

inthe investigating radiation core practicalwhat isthe aim

A

invistage how the nature of surfaces affect the amout of thermal energy radiated or absorbed

53
Q
A

physics (8 decks)

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