P12 &P13 Waves And EM Flashcards
What is an oscillation?
The period of an oscillation is the time it
takes for one full oscillation to happen.
What is a wave?
A wave is a series of oscillations that travel
from one place to another, transferring energy.
What is a Transverse Waves?
In a transverse wave, the direction of oscillation perpendicular is to the direction of wave motion.
What is a Longitudinal Wave?
In a longitudinal wave, the direction of oscillation is parallel to the direction of wave motion.
What is P-wave?
P-Wave (Primary Wave) cause the initial tremors lasting about 1 minute. These longitdunal wave (compression wave) push and pull on material as they move through the Earth.
What are S-waves?
S-Waves (Secondary Waves) cause more tremors a few minutes later. They are transverse waves that travel more slowly than P-waves. They shake material that they pass through inside the Earth side to side.
What are L-waves?
L-Waves (Long Waves), arrive last and cause violent movements on the surface up or down as well as backwards and fowards. They travel more slowly than P-Waves or S-Waves and they only happen in the Earth’s crust.
What are Ultrasound?
Ultrasound waves are longitdunal vibrations that have a frequency higher than the limit of human hearing.
How do you find the Wave speed?
Frequency X Wavelength
What are the units of Wave speed?
Metres per Second (m/s)
What are the units for Frequency?
Hertz (Hz)
What arw the units for Wavelength?
Metres (m)
What are the units for Period?
Seconds (s)
How do you find Period?
1/Frequency
What is the Law of Reflection?
The reflected waves move away from the barrier at an equal angle to the incident waves.
What is Law of Refraction?
Refraction of waves is the change of direction of the waves when they travel across a boundary, from one medium to another.
