Topic 1 (Waves, Sound And The EM Spectrum

Question 1

Diagram for eye

Answer 1

Look at it right now you poo poo head

Question 2

Function of the iris?

Answer 2

It controls the amount of light that enters the eye by opening and closing the pupil

Question 3

Function of the cornea?

Answer 3

It acts as the eyes outer most lens. It functions like a window that controls and focused the entry of light into the eye.

Question 4

Function of the pupil?

Answer 4

It controls the amount of light entering the eye.

Question 5

Function of the lens?

Answer 5

It transmits light, focusing it on the retina

Question 6

Function of the retina?

Answer 6

It is an essential part of the eye that enables vision.

Question 7

Function of the Optic nerve

Answer 7

The optic nerve transmits sensory information for vision in the form of electrical impulses from the eye to the brain

Question 8

What is the explanation for the looking at a dot in a circle expirament

Answer 8

After focusing on an image for 25 seconds then looking at a bright surface a chemical is released in the eye which slows down the rate at which the electrical signal of the image sent to the brain is last.

Question 9

What happens when a ray enters a glass block at 90 degrees?

Answer 9

It passes straight through

Question 10

What happens when a ray enters the glass block at any other angle?

Answer 10

It bends towards the normal

Question 11

What happens when a ray comes out of the glass block at 90 degrees?

Answer 11

It continues straight

Question 12

What happens when the ray comes out of the block at any other angle?

Answer 12

It bends away from the normal.

Question 13

Compare the direction of a ray entering a glass block with the direction of the ray emerging from the opposite side.

Answer 13

Parallel

Question 14

How does refraction occur?

Answer 14

When a wave moves from a less dense to a more dense medium

Question 15

When parallel rays pass through a lens they converge, what lens is this?

Answer 15

Converging lens

Question 16

When parallel rays pass through a lens they diverge, what lens is this?

Answer 16

Diverging lens

Question 17

What is dispersion?

Answer 17

It’s a statical term that describes the size of the distribution of values expected for a particular variable and can be measured by several different statistics, such as range, variance and standard deviation

Question 18

How does dispersion occur?

Answer 18

Because violet light slows down more and bends more than red light

Question 19

The visible light we can see is just a small part of a much bigger spectrum, what is the spectrum Called?

Answer 19

The electro magnetic spectrum

Question 20

What is the electro magnetic spectrum made up of?

Answer 20

Several types of waves

Question 21

Name the 7 types of radiation in order

Answer 21

1. Radio waves
2. microwaves
3. Infrared
4. visible
5. ultra violet
6. X-rays
7. Gamma rays

Question 22

All uses and dangers for the radiations

Answer 22

Gamma rays-can detect cancer and can destroy cells
X-ray-longer wave length don’t pass through bones and slightly increased risk of cancer
UV-kills bacteria and gives skin cancer
Visible-take photo graphs
Infrared-felt as heat and cooks food
Microwaves-cook food and can cook parts of body
Radio-communications
Visible-

Question 23

All E-M waves travel at the speed of light through what?

Answer 23

A vacuum

Question 24

What can a white light be split into?

Answer 24

The colours of the rainbow (ROYG BIV)

this is dispersion