This is a presentation I had done for an Intro to Science course in 2011.

1. Environment
Sound is a Longitudinal
wavelength. The way we
perceive a sound depends
on its wavelength,
frequency and amplitude.
High frequency sound
waves give off a high pitch
noise, while lower
frequencies give off a lower For certain animals sound is not only
pitched noise a way to communicate but also a
way to maneuver and locate food
sources. A bat navigate by emitting
high-pitched sound waves and
listening for the reflection of those
waves off of near by objects to
determine their distance. Their
hearing is so well adapted that
they can detect the presence of an
insect up to 10 meters away.

2. Environment Cont.
Do you ever wonder why the grass
is green, or why the sky is
blue?
The answer is visible light. Visible
light is a type of electromagnetic
wavelengths range from red light
at about 700 nanometers down to
violet at about 400 nanometers So
as you can see from the chart to
the right , green leaves reflect a
higher frequency of visible light
than that of a red petal.

3. Health
An electromagnetic wave that most of us
are familiar with is the X-ray. As seen
on the previous slide X-ray's
wavelength is about 100 nanometers
down to 0.1 nanometers (smaller than
a single atom). These high frequency
waves can penetrate several
centimeters into most solid matter are
absorbed to different degrees by all
kinds of materials.
X-rays are often used to prevent
harmful materials from entering
public places such as airports.

4. Health Cont.
Medical X-ray machines are like
giant light bulbs in a glass vacuum
tube. One end of the tube is a
tungsten filament that is heated to a
very high temperature by an
electrical current at the other end is
a polished metal plate. The X-ray is
then produced by applying high
voltage negative current on the
filament and a positive current over
the polished metal plate. This
causes electrons to stream across
the filament and smash into the
plate at high velocity creating what
you see as a medical x-ray.

5. Geology
Once a wave has been generated its
movement is independent from its
origin.
In the study of the earth we can see
how waves of energy generated
by the movement of tectonic
plates disperses and often causes
natural disasters.

6. Geology Cont.
The consequence of waves' movement being
independent from its source is called The Doppler
Effect; A change in the observed frequency of a
wave, as of sound or light, occurring when the
source and observer are in motion relative to each
other, with the frequency increasing when the
source and observer approach each other and
decreasing when they move apart. The motion of
the source causes a real shift in frequency of the
wave, while the motion of the observer produces
only an apparent shift in frequency. Also called
Doppler shift.
Meteorologists use Doppler radar to measure wind
speed and direction during the approach of the
storms to help predict the weather.
Doppler radar works by sending out microwaves
through a central antennae When these
microwaves encounter different types of
precipitation they reflect back to the antennae in
frequencies unique to that type of precipitation.
Doppler radar can detect precipitation and wind
speed because it not only measures the frequency
of the returning waves but also their intensity.

7. Geology Cont.
The consequence of waves' movement being
independent from its source is called The Doppler
Effect; A change in the observed frequency of a
wave, as of sound or light, occurring when the
source and observer are in motion relative to each
other, with the frequency increasing when the
source and observer approach each other and
decreasing when they move apart. The motion of
the source causes a real shift in frequency of the
wave, while the motion of the observer produces
only an apparent shift in frequency. Also called
Doppler shift.
Meteorologists use Doppler radar to measure wind
speed and direction during the approach of the
storms to help predict the weather.
Doppler radar works by sending out microwaves
through a central antennae When these
microwaves encounter different types of
precipitation they reflect back to the antennae in
frequencies unique to that type of precipitation.
Doppler radar can detect precipitation and wind
speed because it not only measures the frequency
of the returning waves but also their intensity.