SURVIVAL WITHOUT WAVES ##.... ??

WAVE

Starting with the topic it is a sort of disturbance of one or more fields such that values of field oscillate repeatedly about a stable equilibrium.

Now coming to this point only, we can say about what is called standing and a traveling wave.

STANDING WAVE

If we are considering standing wave, as the name suggests, relative amplitude of oscillation at different points in a field  is taken constant (means they are not changing it's value)

ILLUSTRATIONS

We can consider standing waves in organ pipes and strings

TRAVELING WAVE

For a traveling wave, relation amplitude of oscillation at different points in field is changing.

HOW Can we Categorize WAVES $$$$   .....

Waves are having many different shapes and forms .There are many ways to categorize waves .

Considering on the basis of direction of movement of individual particles of medium relative to direction that waves travel, we are having three categories

1. TRANSVERSE WAVES

2. LONGITUDINAL WAVES

3. SURFACE WAVES

Now discussing it, one by one firstly we have transverse wave.

● TRANSVERSE WAVES

It is a wave in which particles of medium move in a direction perpendicular to direction in which a wave is moving.

 

EXAMPLES:

▪︎ Movement of string of sitar or violin.

▪︎ Movement of membrane of table.

# WAVES AS TRANSVERSE

Electromagnetic waves are termed as transverse waves in addition to other waves.

# PROPAGATION

It travels through a medium in form of Crest and trough.

● LONGITUDINAL WAVES

It is wave in which particles of medium moves in the direction parallel to direction in which  a wave is  moving.

EXAMPLES:

1. Sound waves travel through air in the form of longitudinal waves

2. Vibrations of air column in organ pipes are longitudinal waves

# PROPAGATION

It travels through a medium in the form of compression and rarefaction.

● SURFACE WAVES ▪︎▪︎▪︎....

Surface wave is a wave in which particles of the medium undergo a circular motion. Surface waves are neither longitudinal nor transverse. In longitudinal and transverse waves, all the particles in the entire bulk of the medium move in a parallel and a perpendicular direction (respectively) relative to the direction of energy transport. In a surface wave, it is only the particles at the surface of the medium that undergo the circular motion. The motion of particles tends to decrease as one proceeds further from the surface.

• Surface wave is a mechanical wave that propagates along the interface between differing media. A common example is gravity waves along the surface of liquids, such as ocean waves.

FURTHER DETAILS........

Waves traveling through a solid medium can be either transverse waves or longitudinal waves. Yet waves traveling through the bulk of a fluid (such as a liquid or a gas) are always longitudinal waves. Transverse waves require a relatively rigid medium in order to transmit their energy. As one particle begins to move it must be able to exert a pull on its nearest neighbor. If the medium is not rigid

as is the case with fluids, the particles will slide past each other. This sliding action that is characteristic of liquids and gases prevents one particle from displacing its neighbor in a direction perpendicular to the energy transport. It is for this reason that only longitudinal waves are observed moving through the bulk of liquids such as our oceans. Earthquakes are capable of producing both transverse and longitudinal waves that travel through the solid structures of the Earth. When seismologists began to study earthquake waves they noticed that only longitudinal waves were capable of traveling through the core of the Earth. For this reason, geologists believe that the Earth's core consists of a liquid - most likely molten iron.

While waves that travel within the depths of the ocean are longitudinal waves, the waves that travel along the surface of the oceans are referred to as surface waves.

LIFE AND WAVES

As from the discussion we find out that wave is an important part of life

 

As transverse waves are in form of:

 • ripples on the surface of water

 • Vibrations in a guitar string

 • Mexican wave in a sports stadium

 • Electromagnetic waves – eg light waves, microwaves, radio waves

 • Seismic S-waves

LONGITUDINAL waves are in form of:

• Sound waves

 • Ultrasound waves

 •seismic P-waves

Surface waves are used in

• Geotechnical Engineering

• The use of surface waves (SW) in seismology is well known since the pioneering works Dіer the First World War in the 1920s and 1930s. In the 1950s and 1960s, thanks to computer and instrumental improvements, surface waves started to be intensively adopted in global seismology.

• In seismology, several types of surface waves are encountered. Surface waves, in this mechanical sense, are commonly known as either Love waves (L waves) or Rayleigh waves. A seismic wave is a wave that travels through the Earth, often as the result of an earthquake or explosion. Love waves have transverse motion (movement is perpendicular to the direction of travel, like light waves), whereas Rayleigh waves have both longitudinal (movement parallel to the direction of travel, like sound waves) and transverse.

RECENT DISCOVERY IN SURFACE WAVES

HOW CRYSTALS CAN BE MANIPULATED TO PRODUCE A DISTINCTIVE FORM OF A WAVE $$ ... DYAKONOV- VOIGT SURFACE WAVES

• These are produced at surface known as interface, where crystals meet another material, such as oil  or water.

• These can be only produced by certain types of crystal, whose optical properties depend on direction in which light passes through them.

• These are found to diminish as they move away from an interface, process called decay and travel.

• In comparison to other surface waves, their decay is less and travel only in single direction.

• It makes it useful in biosensors used to screen blood samples or for optical fibres circuits to increase efficiency of transferring data.

%% IF WE ARE CONSIDERING AN INTERACTION BETWEEN A CRYSTAL AND METALLIC OR NON METALLIC SURFACE, THERE CAN BE POSSIBILITY OF PRODUCTION OF A NEW WAVE.......??

I just want to end the topic, or I should say discussion as topic is yet not having an ending stop, with a question for readers...

Waves are everywhere, but have you ever felt the presence of a wave nearby you??

By: Priya Mahajan