Visible Light And The Solar System

Question 1

What is the geocentric model

Answer 1

A model of the solar system in which everything orbits the earth

Question 2

What is a heliocentric model

Answer 2

A model of the solar system where everything orbits the sun

Question 3

How did Galileo realise the heliocentric model was true

Answer 3

Using an early telescope, he discovered Jupiter had moons by tracking there paths, this showed that not everything orbited the earth

Question 4

What is refraction

Answer 4

The change of speed and direction of a wave when it enters a new material

Question 5

What is the interface in refraction

Answer 5

The point where refraction occurs, the boundary between two materials

Question 6

What is the normal

Answer 6

A perpendicular line to the interface

Question 7

What is the incident ray

Answer 7

The ray that enters the new medium

Question 8

What is the refracted ray

Answer 8

The ray after the incidence ray has refracted

Question 9

What is the ange of incidence and angle of refraction

Answer 9

Angle of incidence is the angle the incidence ray entered to the normal
Angle of refraction is ange the refracted ray is to the normal

Question 10

What is a converging/convex lense

Answer 10

A lens that is curved outwards on both sides so it become thicker the closer to the middle

Question 11

Wat are the properties of a convex lens

Answer 11

Refracts light inwards, the thicker it is, the greater the angle of refraction and the closer the focal point

Question 12

What is the focal point

Answer 12

The point in which refracted light rays meet

Question 13

What is the focal length and how can it be found

Answer 13

The length between the lens and the focal point, can be found by focussing the image onto a piece of paper and measuring the distance between the paper and the lens

Question 14

How does a refracting telescope work

Answer 14

Light enter the objective ( a convex lens) lens that’s in a tube, this refracts the light and an eyepiece lens the magnifies the image

Question 15

What is the difference between a real and virtual image

Answer 15

A real image. The rays actually meet where the image is seen, it can be put onto a screen such as paper
A virtual image, the rays appear to come from the image but don’t, it can’t be shown on a screen. E.g. Mirrors make virtual images

Question 16

What are the problems with refracting telescopes

Answer 16

They need to be very long for a good magnification
If the lens insnt perfect, the colours wont be correct, it’s hard to make a large lens perfect
As some light is always reflected as well as refracted on the boundary, it’s hard for them to magnify faint images such as distant stars

Question 17

How does a reflecting telescope work

Answer 17

Light enters the tube and reflects of a curved primary mirror, this focuses the parallel rays towards the secondary mirror, this reflects the light into the magnifying eyepiece

Question 18

What are transverse waves

Answer 18

Waves in which movement of wave is perpendicular to movement of energy. S waves and electromagnetic waves are transverse

Question 19

What are longitudinal waves,

Answer 19

Waves that travel in pulses such as sound and look like this

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Question 20

What is frequency and its unit and formula

Answer 20

Amount of waves per second, measured in Hz hertz. Formula is

Amount of waves divided by time in seconds

Question 21

What is wavelength

Answer 21

Length of one wave, distance between two crests or two troughs

Question 22

What is amplitude

Answer 22

Furthest distance from middle of wave, crest to the middle

Question 23

Wave length formulas

Answer 23

Distance(M)/time(S)

Frequency(Hz)*wavelength(M)