P5

Question 1

How do you hear things

Answer 1

soundwave travels through ear canal
vibrates ear drum
vibrations travel along the ear bones (ossicles)
cochlea trasnmits the vibratins to the cilia
cilia converts to electrical signals
auditory nerve carries electrical signal

Question 2

how does an ultra sound scan work

Answer 2

transmitter on skin
wave reflected at boundaires
reflected waves are recieved and an image forms
can calculate depth 
distance  = speed*time

Question 3

what are the dangerous electromagnetic waves

Answer 3

UV -damage and cause cancer
X-ray - damage and cause cancer
gamma - kill cells and can damage and caue cancer

Question 4

hwo to measure the speed of sound

Answer 4

two people set distance apart
one makes a noise
measure time between seeing and hearing the clap
speed = distance/ time
OR
micorphones oscilloscope
signal generator attatched to speakers known freuency sound
move one microphone further away until the waves on the oscilloscopes line up again

Question 5

what is the relationship between angle of incidence and angle of reflection

Answer 5

they are equal