periodic motion
give an example of periodic motion
a carisol
a spring
clock
year
define a wave
the movement of energy from one source to another
If a wave hits a mirror at an angle of 25 degrees what angle will it reflect at
25
what is the period of a minute hand on a clock
60 minutes
give an example of a mechanical wave compared to an electromagnetic wave and explain what they travel through
mechanical: sound, seismic wave, water (solid, liquid, gas)
electromagnetic: light (vacuum)
what are the two types of interference, describe them?
constructive: two waves add to get bigger
destructive: two waves cancel each other out
according to periodic motion why can we use the sun's movement in the sky to tell time?
it moves at a constant speed and in the same direction so it can be a reliable source of the time of day
what is the difference between wave height and wave length
wave height: the difference between the crest and trough
wave length: the distance between two crests
A log is in a lake, half in water. What wave behavior causes its shape to look different in the water?
refraction
compare and contrast resonance and damping
compare: they are both changing the periodic motion of an object
damping: slows it down
resonance: speeds it up
if a wave has a period of 5 seconds, how many waves will pass in 30 seconds
6
describe and give an example of diffraction
the scattering of wave
ex: light prism, or waves around an island
what force causes the spring to go back up towards the equilibrium once it has been stretched out
restoring force and momentum
give an example of a transverse wave compared to a longitudinal wave
t: light, guitar strings
l: sound
an ambulance comes towards you and gets louder. Explain why this happens using the word frequency and pitch
the frequency gets bigger and the pitch gets higher