Waves Flashcards
Define amplitude
Amoun to energy carried by a wave
Define frequency
Number of complete waves passing a fixed point per second
Whats the equation for wave speed?
Wave speed = frequency x wavelengtg
Define a longitudinal wave.
Vibratik s that are parallel to the direction the energy travels
Define a transverse wave.
Vibrations are perpendicular to the direction energy travels
What frequency is ultrasound?
20MHz - above human hearing
What frequencies can humans hear?
20 - 20,000 Hz
How does ultrasound work?
The waves hit a boundary and are partially reflected - measure the length of time it takes them to return - use this to create an image
What is the ray entering the block called?
Incident ray
What is the ray on the block called
Refracted ray
What is the ray leaving the block called?
Emergent ray
What is the angle of incidence equal to?
The angle of refraction
What are the two angles in the refraction experiment?
Angle of incidence and angle if refraction
What does P wave stand for?
Primary
What does S wave stand for?
Secondary
Which wave is transverse
S waves
Which wave is longitudinal
P waves
Which wave can only travel through solids?
S waves
Which wave can travel through solids and liquids?
P waves
What is a Ray about to it a mirror called?
Incident ray
What is a Ray reflected from a mirror called?
Reflected ray
What angle is the normal at to the mirror?
90 degrees
What is the shortest wavelength colour
Violet
What colour has the longest wavelength?
Red
