what is reflection?
its when a wave bounces off a surface
what are 2 features of a reflection?
Angle of incidence = angle of reflection
what is some uses of reflection?
it is used in sonar, ultrasound scanning, radar.
what is Refraction?
it is where wave changes direction at boundary due to speed change.
what is diffraction?
it is the spreading of waves when passing through gap or around obstacle.
When does diffraction of waves through a gap produce the maximum spreading effect?
Maximum when gap ≈ wavelength.
what are some uses of diffraction?
it is used in X-ray and crystallography
what is Superposition?
it is when two waves meet, displacements add.
what happens in constructive interference?
there is a larger amplitude
what happens in deconstructive interference?
the waves cancel out
what is superposition used for?
Basis of noise-cancelling headphones, interference patterns.
