Ch 6/7: 4.17.19 Weekly Quiz material Flashcards
the change in direction when a wave strikes a surface or boundary
reflection
the motion when an object receives a force that is in sync with the object’s natural vibration
resonance
the speed of light in a vacuum (a constant) is?
the angle at which light doesn’t come out of the more dense medium, but travels the boundary
critical angle
equation: law of reflection
angle of incidence is equal to angle of reflection
when light doesn’t come out, but reflects back into the more dense medium
total internal reflection
a diffuse reflection looks like…
the lowest frequency of a note played on a musical instrument
fundamental frequency
how are a piano and a trumpet playing the same note different?
the two have different sets of harmonics
the change in direction as a wave goes from one medium to another
refraction
a reflection caused by the surface being rough enough for reflected ways to not be parallel
diffuse reflection
how are a piano and a trumpet playing the same note alike?
the notes have the same fundamental frequency
a diagram of an underwater flashlight hitting the surface in 3 ways looks like:
the imaginary dashed line perpendicular to the surface at the point of contact
the “normal”
the other frequencies of a musical note
harmonics
how are waves of light thought to travel?
in a straight line from their source, until they contact a surface or boundary
what are each of the labeled parts of this picture?
- A: incident ray
- B: reflected ray
- C: object or boundary
- D: the “normal”
- theta(i): angle of incidence
- theta(r): angle of reflection
exampes of resonance?
- rocking chair
- swing
- “rocking” a goal post (football)
- plucking strings on a guitar
equation: index of refraction
index of refraction (n) is the speed of light in a vacuum (c, 3.00 x 10^8 m/s; a constant) over speed of light in the medium (v)
a regular reflection looks like…
a reflection caused by the surface being smooth enough for reflected rays to be parallel
regular reflection
