Vocab 1
What is a medium?
The material through which a wave travels.
What is wavelength
the distance from one point on a wave to the identical point on the next wave.
Name the medium for the following three waves; ocean waves, music, and a towel waving in the wind.
water
air
towel
How are frequency and wave period related
If we have a frequency of 1 Hz, what is our wave period?
What is a wave?
a disturbance that transfers energy from one place to another.
What is frequency measured in
Hertz
Are sun's rays mechanical or electromagnetic? how do you know?
Electromagnetic. The light has to travel through space where there is no medium to get to us.
What is the speed of an electromagnetic wave in a vacuum?
speed of light
If we have a wavelength of 3m and a frequency of 5 Hz, how fast is the wave moving?
15 m/s
What type of wave moves particles back and forth in the same direction that the wave travels?
Longitudinal waves
What is frequency?
The amount of wave cycles that happen in a certain amount of time.
Why can we not hear a phone ringing out of a jar?
there is no air in the jar
Why does the energy of a sound wave decrease over time?
The energy spreads, having more area to cover the farther we get from the source
If we have a wavelength of 4m and a wave period of 2s what is our wave speed.
2 m/s
What type of wave moves particles perpendicular to the direction the wave travels?
Transverse wave
what is amplitude
The measure of how far particles in the medium move away from their resting spot
What type of wave has troughs and crests, and where are they located?
Transverse waves
Troughs are the lowest point
crests are the highest point
A wave has a low speed but a high frequency, what does that tell us about the wavelength?
It is a small wavelength
If we have a wave speed of 200 m/s and a frequency of 10 Hz, what is the wave length?
20 m
What is one difference between mechanical and electromagnetic waves?
mechanical waves require a medium to travel through, electromagnetic waves do not.
What is one formula to find wave speed.
ws=wl x f
ws= wl / wp
What type of wave has compression and refraction, and what are compression and refraction.
Longitudinal wave
compression is when the coils are close together
refraction is when the coils are far apart
Why does the speed of sound depend on air temperature?
The hotter the air the faster the particles move. The faster particles move the more collisions can occur. The more collisions occur the faster the wave can move.
If the wavelength is 5 m and the wave speed is 25 m/s what is the frequency of the wave?
5 Hz