lets communicate

Question 1

what are the properties of waves

Answer 1

a wave is a vibration that can carry energy without moving mass

Question 2

what are the two types of waves

Answer 2

longitudinal wave (sound wave)- vibrations of particles parallel to the wave direction

transverse wave (light wave)- vibration of particles perpendicular to the wave direction

Question 3

what is a constructive wave interference

Answer 3

crests align and join together- higher sound

Question 4

what is destructive wave interference

Answer 4

the crests and the troughs of two waves are in sync and cancel each other out (noise cancelling headphones)

Question 5

what are the properties of sound waves and how does our body detect them

Answer 5

Sound is a longitudinal wave. The way that we perceive sound is due to the changes and shape of a wave.

Question 6

What does the amplitude change

Answer 6

volume (smaller amplitude = lower volume)

Question 7

what does the frequency change

Answer 7

pitch (higher frequency = higher pitch)

frequency is measured in Hz

Question 8

How do sound waves travel

Answer 8

They can travel through solids, liquids and gas but not through a vacuum (space). They travel by transferring vibrations from particle to particle as they hit each other.

Question 9

what is compression

Answer 9

particles are pushed closer (denser)

Question 10

what is refraction

Answer 10

particles are pushed apart

Question 11

what do sound waves travel the slowest in

Answer 11

Gas particles as the particles are further away meaning it takes longer for one vibrating particle to make contact with another

Question 12

what is the wave equation

Answer 12

v = f lander

Question 13

what is the law of reflection

Answer 13

angle of incidence = angle of reflection

Question 14

what happens when a sound wave hits a new medium with a different density

Answer 14

the wave is either absorbed or reflected

Question 15

what happens when the sound hits a wall

Answer 15

most of the wave is reflected, some of the sound is absorbed and some of the sound are transmitted through the wall.

Question 16

what absorbs sound better softer or harder materials?

Answer 16

Soft materials absorb sound much better than harder materials because particles are more further apart meaning more energy is used to transmit the sound.

Question 17

what is the pianna and what does it do

Answer 17

collects waves from the outside and channels vibration through the ear canal

Question 18

what is the ear drum and what does it do

Answer 18

the vibrations reach the eardrum which are picked up by the ossicles bones

Question 19

what is the inner ear/cochella and what does it do

Answer 19

the ossicles move in and out of the oval window in the inner ear which causes the hair in the cochella to vibrate sending an electrical pulse to the auditory nerves in your brain which interprets it as a sound

Question 20

what are the properties of light waves

Answer 20

a light wave is an electromagnetic transverse wave that always travels in straight lines. Because light is an electromagnetic wave and self-propagating, and does not need a medium it can travel through a vacuum.

Question 21

what does the wavelength of light determine

Answer 21

its colour (ROYGBIV) red has the lowest frequency to violet which has the highest

Question 22

what is a concave mirror

Answer 22

curves inwards and when light is reflected the rays converge and cross at the focal point

Question 23

what is a convex mirror

Answer 23

curves outwards and when light is reflected the light rays spread out- diverge

Question 24

what happens to light when it passes through different mediums with different desnitites?

Answer 24

the speed of light changes

Question 25

what happens if light slows down

Answer 25

bends towards the normal

Question 26

what happens if light speeds up

Answer 26

bends away from the normal

Question 27

what is a convex lens

Answer 27

bend the rays towards each other (converging) and are used to magnify objects

Question 28

what is a concave lens

Answer 28

bend the rays away from each other (diverging) and makes objects appear smaller

Question 29

What happens when visible light is combined?

Answer 29

we see white light

Question 30

how can prisms seperate white light into a rainbow?

Answer 30

the different colours of light travel at different speeds inside the glass and are therefore bent by different amounts and are separated. Red is refracted the least, violet is refracted the most

Question 31

What are the primary and secondary colours of light

Answer 31

primary colours are red, blue and green as when these wavelengths are combined white light is formed. Secondary colours of light are yellow, magenta and cyan and are formed when 2 of the primary colours come together

Question 32

colour filters

Answer 32

they allow for some wavelengths (colours) of light to pass through but not others. Red light can pass through a red filter but blue and green light are absorbed by the filter and therefore we see red

Question 33

function of the lens

Answer 33

admits light into the interior of the eye

Question 34

function of the sclera

Answer 34

protects and supports the eyeball

Question 35

function of the iris

Answer 35

admits light into the interior of the eye

Question 36

function of the pupil

Answer 36

controls the amount of light coming into and out of the eye

Question 37

function of the retina

Answer 37

contains speciallised cells that convert the light energy into an electrical signal

Question 38

function of the optic nerve

Answer 38

transmits the electrical signal into the brain

Question 39

The electromagnetic spectrum

Answer 39

Gamma ray, x-ray, ultraviolet, visible, infrared, microwave, radio the shortest wavelength, highest frequency and highest energy is at the gamma ray end of the spectrum all the way to the radio which has long wavelength, low energy and low frequency

Question 40

what are the two communication systems within the body

Answer 40

nervous system and endocrine system

Question 41

what is the nervous system

Answer 41

brain is the control of this system which creates connections or pathways between neuron cells. Messages are sent to and from the brain along the spinal chord and neurons carry messages through an electrical process.

Question 42

what is the endocrine system

Answer 42

several organs in the body called glans located all over the body and create hormones. hormones are chemicals that coordinate different functions in the body by carrying messages through your blood.