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.
