List two differences between electromagnetic waves and sound waves.

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Waves may be defined as vibrations that propagate in space carrying energy.

There are different kinds of waves in nature. 

1. Sound waves are waves that propagate in elastic mediums (mediums that can vibrate) like atmospheric air, metals, water, etc. They are classified as mechanical waves, because the sources that generate...

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Waves may be defined as vibrations that propagate in space carrying energy.

There are different kinds of waves in nature. 

1. Sound waves are waves that propagate in elastic mediums (mediums that can vibrate) like atmospheric air, metals, water, etc. They are classified as mechanical waves, because the sources that generate sound waves vibrate mechanically. As such, they require an elastic medium through which to propagate.

2. Wave oscillations may be longitudinal or transversal in relation to the direction of propagation of the wave. Sound waves are longitudinal, i.e., their vibrations are along the direction of propagation.

1a. Electromagnetic waves are produced by oscillating electric charges, that is, they are not mechanical vibrations but field (electric and magnetic) oscillations.

2a. Electromagnetic waves are transversal waves, that is, their electric and magnetic oscillations occur perpendicular to the direction of their propagation. 

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A sound wave is the transmission in space and time, of the mechanical oscillations produced by a source. An electromagnetic wave is the transmission in space and time of electric and magnetic fields, which are mutually generate each other during the propagation.

Sound waves are mechanical waves, and have, inter alia, the following differences with respect to electromagnetic waves:

1. Sound waves require an elastic medium to propagate from the source. Electromagnetic waves do not require a medium for propagation, can be transmitted even in the absolute vacuum.

2. Sound waves are longitudinal waves that is, are transmitted in the same direction of oscillation of the particles in the medium. Electromagnetic waves are transverse ie, the electric and magnetic fields, which are perpendicular to each other, oscillate perpendicularly to the direction of wave propagation.

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Sound waves and electromagnetic waves are physical manifestation of vibrations happening in the universe. These two phenomena are important in the advancement of science and technology on earth. Sound waves are vibration or pattern of disturbances caused by movement of energy travelling on a medium such as air, water or other solids. Basically, the vibrations disturb the first medium it touches and it disturb the next to it and so on. We are able to sense the sound because the sound waves move the air molecules until it touches our eardrums. These vibrations in our ears are perceived in the brain as sound. Electromagnetic waves are transverse waves that oscillate perpendicular to the direction of the energy transfer or direction. Electromagnetic waves can travel through a vacuum, meaning it does not need a media for it to flow. Not all electromagnetic waves can pass through a certain object. 

Sound waves: requires a medium
Electromagnetic waves: Don't need a medium

Sound waves: longitudinal waves
Electromagnetic waves: Transverse waves

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