The document defines key terms related to waves, including: - Crest, trough, amplitude, wavelength, frequency, period, wave speed, wavelength, loudness, intensity, quality, and pitch. It also describes transverse waves, where particles vibrate perpendicular to the wave, and longitudinal waves, where particles vibrate parallel to the wave. Reflection and diffraction of waves are also discussed.

3. PARTS OF THE WAVE

4.  CREST - the highest point of the
wave.
 TROUGH - the lowest point of the
wave.
 AMPLITUDE - is the displacement
from the resting position to the
highest (or lowest) point of the wave.
 WAVELENGTH – is the distance from
one point to the next identical point
of the wave.

5.  FREQUENCY – describes how often a
vibration occurs. It also specifies how many
complete vibrations occur at a given time
(usually one second).
1 1
F = or
T Period
* The SI Unit of frequency is the HERTZ (Hz)
, equivalent to one cycle per second.

6.  PERIOD – is the time needed to
complete one vibration.
1 1
T = or
F Frequency

7.  WAVE SPEED - is the rate at which the
wave travels through a particular point.
Wave speed = Frequency x Wave length
or
wavelength
Wave speed =
period

8.  WAVELENGTH – distance from crest to crest.
The wavelength λ of a sinusoidal waveform
traveling at constant speed v is given by:
v
λ =
f
where v is called the phase speed (magnitude of
the phase velocity) of the wave and f is the
wave's frequency.

9.  LOUDNESS - physiological sensation that
varies from one person to another. It
depends on the sense of hearing.
 INTENSITY (I) - depends on the amplitude
of pressure variations within the sound
waves. The unit used for sound intensity
level (B) is decibel (dB) , named after
Alexander Graham Bell.
 QUALITY – enables to identify the source
of sound because tones differ from one
another.
 PITCH – refers to the highness or lowness of
a tone. It is related to frequency.

10. REFLECTION OF
WAVE
a.) REFRACTED- when wave travel from
one medium to another.
b.) DIFFRACTED- when wave pass
through a narrow opening and interfere
when they interact with other wave.

11. TRANSVERSE WAVE
 The vibrational direction of the particles in the medium is
up and down perpendicular to the direction of the wave.

12. LONGITUDINAL WAVE
 The vibrational direction of the particles of the medium is
parallel to the direction of the wave.

13.  Prepared by:
 Katherine B. Pon-an
 Kristine Camille R. Robles
 Paul Nicko D. Ferrer
 Marjay G. Panganiban
 Joven M. Reyes
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