Science Edexcel: P1 Topic 1

Front 1

optical telescope disadvantages

Back 1

can only be used at night

cannot be used in cloudy or poor weather

Front 2

proof of heliocentric model

Back 2

Galileo discovered four of Jupiters moons with a telescope and by plotting their movements he showed that not everything orbited the Earth

Front 3

radio telescopes advantage over optical telescopes

Back 3

they can be used in bad weather because the radio waves are not blocked by clouds as they pass through the atmosphere and can be used in the day time as well as the night

Front 4

why do x ray telescopes need to be at a high altitude

Back 4

they are partly blocked by the earths atmosphere

Front 5

who came up with geocentric model

Back 5

Ptolemy

Front 6

who came up with geocentric model

Back 6

Ptolemy

Front 7

who came up with heliocentric model

Back 7

Copernicus and Galileo proved it

Front 8

how do people study distant objects

Back 8

scientists use waves to find out information about the universe. luminous objects in space give us visible light that travels as waves of energy. these visible light waves allow people to study distant objects

Front 9

how do people study distant objects

Back 9

scientists use waves to find out information about the universe. luminous objects in space give us visible light that travels as waves of energy. these visible light waves allow people to study distant objects

Front 10

what's a converging lens

Back 10

a converging lens is curved on both sides. this means the light rays coming out of it come together at a point and converge

Front 11

how do people study distant objects

Back 11

scientists use waves to find out information about the universe. luminous objects in space give us visible light that travels as waves of energy. these visible light waves allow people to study distant objects

Front 12

what's a converging lens

Back 12

a converging lens is curved on both sides. this means the light rays coming out of it come together at a point and converge

Front 13

how do you find the focal length

Back 13

by focussing a distant object on a piece of paper through the lens. the focal length is the distance between the centre of the lens and the image.

Front 14

how do people study distant objects

Back 14

scientists use waves to find out information about the universe. luminous objects in space give us visible light that travels as waves of energy. these visible light waves allow people to study distant objects

Front 15

what's a converging lens

Back 15

a converging lens is curved on both sides. this means the light rays coming out of it come together at a point and converge

Front 16

how do you find the focal length

Back 16

by focussing a distant object on a piece of paper through the lens. the focal length is the distance between the centre of the lens and the image.

Front 17

what is the focal point

Back 17

the point at which the light rays meet

Front 18

converging lenses are often used to produce images that are magnified. the amount of magnification depends on:

Back 18

how curved the surface of the lens is and how close the lenses are placed

Front 19

what is a real image

Back 19

the image formed where the light rays are focused

Front 20

what is a real image

Back 20

the image formed where the light rays are focused

Front 21

what is a virtual image

Back 21

the light rays appear to come but don't actually come

Front 22

what is a real image

Back 22

the image formed where the light rays are focused

Front 23

what is a virtual image

Back 23

the light rays appear to come but don't actually come

Front 24

problems with refracting telescopes?

Back 24

some of the light reflects off the lens so the image is very faint.

and

large lenses are needed to improve the magnification which can be difficult to do accurately

Front 25

what is a real image

Back 25

the image formed where the light rays are focused

Front 26

what is a virtual image

Back 26

the light rays appear to come but don't actually come

Front 27

problems with refracting telescopes?

Back 27

some of the light reflects off the lens so the image is very faint.

and

large lenses are needed to improve the magnification which can be difficult to do accurately

Front 28

why does refraction occur

Back 28

refraction occurs because light travels at different speeds through different densities

Front 29

what is a real image

Back 29

the image formed where the light rays are focused

Front 30

what is a virtual image

Back 30

the light rays appear to come but don't actually come

Front 31

problems with refracting telescopes?

Back 31

some of the light reflects off the lens so the image is very faint.

and

large lenses are needed to improve the magnification which can be difficult to do accurately

Front 32

why does refraction occur

Back 32

refraction occurs because light travels at different speeds through different densities

Front 33

what does the eyepiece lens do?

Back 33

takes the bright light from the focus of the objective lens or primary and spreads it out (magnifies it) to take up a large portion of the retina

Front 34

when can a wave be transmitted across a boundary, change its speed, and still not refract?

Back 34

when the light wave approaches the boundary in a direction that is perpendicular to it

Front 35

when it speeds up it goes ____ the normal

Back 35

away from

Front 36

when it speeds up it goes ____ the normal

Back 36

away from

Front 37

when it slows down it goes ____ the normal

Back 37

towards

Front 38

what happens to particles in an object when a wave transfers energy through it?

Back 38

they do not move

Front 39

what is the amplitude of a wave? what is it measured in?

Back 39

the distance from the centre line to the top of the crest or bottom of the trough. it is measured in metres

Front 40

what is the amplitude of a wave? what is it measured in?

Back 40

the distance from the centre line to the top of the crest or bottom of the trough. it is measured in metres

Front 41

what is the wavelength of a wave? what is it measured in?

Back 41

the distance from any point on one wave to the same point on the next wave along. measured in metres

Front 42

what is the amplitude of a wave? what is it measured in?

Back 42

the distance from the centre line to the top of the crest or bottom of the trough. it is measured in metres

Front 43

what is the wavelength of a wave? what is it measured in?

Back 43

the distance from any point on one wave to the same point on the next wave along. measured in metres

Front 44

what is the frequency of a wave and what is it measured in

Back 44

the number of waves passing through a point per second and hertz

Front 45

what is the amplitude of a wave? what is it measured in?

Back 45

the distance from the centre line to the top of the crest or bottom of the trough. it is measured in metres

Front 46

what is the wavelength of a wave? what is it measured in?

Back 46

the distance from any point on one wave to the same point on the next wave along. measured in metres

Front 47

what is the frequency of a wave and what is it measured in

Back 47

the number of waves passing through a point per second and hertz

Front 48

is light and sound transverse or longitudinal?

Back 48

light is transverse

sound is longitudinal

Front 49

In transverse waves the vibrations are _____ to the direction of travel

Back 49

at right angles

Front 50

In transverse waves the vibrations are _____ to the direction of travel

Back 50

at right angles

Front 51

in longitudinal waves the vibrations are _______ as the direction of travel

Back 51

along the same direction