2. W
hat are W
AVES?
W
ave is propagation of disturbance through a
medium or space by which energy is
transferred.
A single unrepeated disturbance is called wave
pulse.
A succession of periodic disturbance
is called wave train.
3. Kinds of W
aves
-
-
According to the direction of motion
transverse wave
longitudinal waves
According to the presence of medium
mechanical waves
electromagnetic waves
6. Mechanical W
ave
requires a medium for the transport of energy
medium can be in solid, liquid or gaseous
state
examples: sound waves, earthquake/
seismic
waves, tidal waves
10. Amplitude
Is the max distance that a wave will travel
away from the rest position
Example, p. 12
In transverse waves the amplitude is measured
by the up and down motion (crest and trough)
In longitudinal waves the amplitude is measured
by how compressed or rarefied the medium is
(more compressions, the stronger the wave)
11.
12. Wavelength
The distance between two corresponding
parts of a wave is its wavelength
Transverse waves are measured from crest to
crest or trough to trough
Longitudinal are measured by the length of the
compressions
13.
14. Frequency
Is the number of complete waves that pass a
given point in an amount of time
Frequency can be increased and decreased
Frequency is measured in hertz
Hertz are measured by waves per second
Example, if a wave passes through a point on a
rope 2 times in one second, it would have a
frequency of 2 Hz
15. Speed
Speed, wavelength, and frequency are all
related
Speed = Wavelength x Frequency
If you know two of the quantities in this
formula you can solve for the other (just like
Ohm’s law)
Frequency = Speed/Wavelength
Wavelength = Speed/Frequency