Visible Light And The Solar System

Question 1

Describe the heliocentric model

Answer 1

The heliocentric model was discovers by Copernicus it states that the sun is at the centre of the universe and every thing orbits it

Question 2

Describe the geocentric model

Answer 2

The earth is at the centre of the universe and everything orbits it

Question 3

How did Galileo disprove the geocentric model

Answer 3

He observed Jupiter’s moons and found that they were moving in the opposite direction to the other planets so they weren’t orbiting the earth therefore the geocentric model could not be true

Question 4

What is wavelength

Answer 4

The distance from the peak of one wave to the peak of the next

Question 5

What is the frequency of of a wave

Answer 5

How many waves pass a point per second it is measured in hertz

Question 6

What is amplitude

Answer 6

The height of the wave from the mid point to the peak

Question 7

What do waves do

Answer 7

They transfer energy and information whiteout transferring matter

Question 8

Speed=

Answer 8

Frequency x wavelength

Or

V=f X lambda

Question 9

Wave speed =

Answer 9

Distance/ time

Or v = x/t

Question 10

What is a transverse wave

Answer 10

All types of em waves
Ripples on water
S waves
Ripples on water

Transfers waves have vibrations at 90 degrees from the direction of travel

Question 11

What are longitudinal waves

Answer 11

Sound and ultra sound
P waves
A slinky spring

The vibrations move in the same way as the direction of travel

Question 12

What is reflection

Answer 12

When a wave hits a boundary between to mediums some energy is reflected

It bounces off of the surface

The angle of incidence is the same as the angle of reflection

Question 13

What is refraction

Answer 13

When waves hit a kindest between different densities they slow down this causes the wave to bend

Question 14

What is a real image

Answer 14

The light from an object comes together to form an image on a screen

Question 15

What is a virtual image

Answer 15

The rays are diverging so the light from the object appears to be coming from a different place

An example is a mirror or a magnifying glass

Question 16

What is a converging lens

Answer 16

The lense is converging so it bulges outwards

When the rays pass through they move together

The focal point is where the rays all meet

Question 17

What is an experiment to show focal length

Answer 17

Clamp a lense at one end of a track then a piece of white card further down the track
Move the card along the track until an image is focused on the card
Use a ruler to measure the distance between the lense and the card

Question 18

How does distance form the lense effect the image

Answer 18

At 2f the image is real and upside down at 2f
Between f and 2f the image will be magnified and upside down beyond 2f
Closer that f the image will be magnified and the right way up beyond 2f on the same side of the lense

Question 19

Describe a refracting telescope

Answer 19

There is an objective and and eyepiece lense the rays are parallel when they reach the objective lense which converges them to form a real image at the focal length the eye piece lense then magnifies the image making it look bigger to our eyes

Question 20

Describe a concave mirror

Answer 20

An incident Ray parallel to the axis while pass through the focal point when it’s reflected
An incident ray passing through the focal point will be parallel to the axis when it is reflected

Question 21

Describe a reflecting telescope

Answer 21

A large concave mirror collects the rays of light from an object in space
The larger mirror reflects the light into a smaller second mirror in front of the larger mirrors focal point
The smaller mirror reflects the light through a hole into the smaller mirror into the eyepiece lens and a real image is formed behind the mirror
They eyepiece lens magnifies the image