Unit 1.2 - Further Waves Flashcards
(34 cards)
What is a critical angle of glass
42°
What is the critical angle of water
49°
What does TIR stand for
Total internal reflection
Refraction equation
Incident angle < Critical angle
Critical case equation
Incident angle = critical angle
Total internal reflection equation
Incident angle > critical angle
In the critical case, the wave passes ____________
Along the boundary
Two conditions for TIR
The light must be travelling from a more dense medium into a less dense medium
The angle of incidence must be greater than the critical angle
How to ensure T I are in optical fibre
Coat the fiber in cladding aids of a lower density
Collision point also known as
Focus
Epi - Latin
Surface
What is the inner core made of
Solid
What is the outer core made of
Liquid
Focus definition
Point from which the shockwaves emanate from, i.e. were tectonic plates collide
Epicentre definition
Point directly above the focus on the Earth’s surface
Where do you seismic waves start
At the focus
Type of primary wave
Longitudinal
Type of secondary wave
Transverse
Properties of primary wave
Travels at 7 km/s
Can travel through liquids and solids
Properties of secondary waves
Travels at 4 km/s
Can travel through solids only
The secondary wave shadow zone begins at
103°
Why is the secondary wave shadow zone occurred
Missed due to secondary waves not being able to go through liquid
In between what two angles is the primary wave shadow zone
103°-140°
Why is the primary wave shadow zone occurred
Missed due to refraction
