3. Sound energy is the energy produced
by vibrating objects. Everything that can be
heard is a sound. Anything but vibrate
produces sound energy. Plucking, strumming,
striking, blowing and hitting can produce
vibrations. Sound travels at different
mediums. It travels faster in solids than in
liquids and in gases. We can communicate
and understand one another because of
sound.
4. How is Sound
Transmitted and Heard?
The force of impact between the two bodies and
vibrations of bodies cause the air molecules
around them to vibrate. The vibrating air
molecules pass on the energy to adjacent air
molecules. In each of our ears, we have a very
sensitive membrane called the eardrum. The
vibrating air causes the eardrum to vibrate.
6. Sound Energy
Transformation
Sound energy is converted into electrical
energy using a diaphragm present in the
microphone. These signals reach the speakers
and then are converted back to sound.
Microphone is an example of a transducer, a
device that changes information from one form
to another. Sound information exists as
patterns of air pressure; the microphone
changes this information into patterns of
electric current.
8. Importance of Sound Energy
Sound is used in communication. To relay
meaning through words requires the use of
sound. We learn things about our environment
and what goes on around us through
communication devices that use sound, like
the telephone, megaphone, mobile phones,
hearing aids, television, and radio
broadcasting. In some cases, sound is reflected
back as an echo.
9. When sound strikes soft materials, it is absorbed. Such
materials that absorb most of the energy of sound waves are called
sound insulators. It helps geologists to locate oil reservoirs and
seismologists to track earthquakes travel through different kinds of
rocks and magma. Sonar (Sound Navigation and Ranging) is an
echo-sounding device that uses sound propagation (usually
underwater, as in submarine navigation) to navigate, communicate
with, or detect objects on or under the surface of the water. (Evelyn
Sarte, 2019)
11. Heat Energy
Heat Energy is the result of the movement of tiny
particles called atoms, molecules or ions in solid,
in liquid, and in gas. It transfers into three ways:
conduction, convection, and radiation. Heat is a
thermal energy. It moves from an object of high
temperature to an object of lower temperature.
Heat can be transformed into mechanical energy.
14. Another transformation is in steam engine, where
heat energy is turned into mechanical energy by
using steam as a medium or working fluid. Steam
or heat engines were the first successful engines
invented and were the driving force behind the
industrial revolution. They have been used to
power the transportation like first trains, ships,
factories, even cars and combustion.
15. Geothermal powerplant transforms the
heat of Earth‟s molten interior to
electrical energy. This energy is used to
generate electricity when water is
injected deep underground and returns
as steam to drive a turbine on an
electric power generator.
17. Light is a form of energy that travels through
empty space and is transported through
electromagnetic waves. Light energy that
comes from the sun is also called radiant
energy. It radiates in all direction.
18. Light travels by electromagnet (EM) waves. The sun‟s
energy travels as visible light, the only EM wave that
can only be seen by the naked eye. Light waves travel
out from their source in straight lines called rays.
(Evelyn Sarte et al, 2019)
19.
20. Light energy cannot move objects on its own. It
can be transformed into another form of energy.
Light energy from the sun is converted to
chemical energy in the form of sugar through the
process of photosynthesis.
It can also be transformed into solar panels, also
known as modules, which contain photovoltaic
cells made from silicon.
