SOUND AND LIGHT WAVES

SOUND WAVES

• Exist as variations of pressure in a medium such as sound.
• The vibrating air then causes the human eardrum to vibrate.which the brains interprets as sound
• They travel through air in much the same way as water waves travel through water.
• Since water waves are easy to see and understand,they are often used as an analogy to illustrate how sound waves behave
• Can also be shown in a standard graph,as shown here.

LIGHT WAVES

• Visible light waves are the only electromagnetic waves we can see.
• We see these waves as the colors of the rainbow
• Each color has a different wavelength
• Red has the longest wavelength and violet has the shortest wavelength
• When all the waves are seen together,they make white light

LIGHT WAVES

• Water vapor in the atmosphere can also break apart wavelengths creating a rainbow
• Cones in our eyes are receivers for these tiny visible light waves.
• The sun is a natural source for visible light waves and our eyes see the reflection of this sunlight
• The color of an object that we see is the color of light reflected
• All other colors are absorbed.light bulbs are another source of visible light waves.

LIGHT WAVES

• Light is at once both obvious and mysterious
• We are bathed in yellow warmth every day and stave off the darkness with bulbs.
• We catch glimpses of its nature when sunbeam angles through a dust filled room.
• Some of the properties of light,such as absorption,reflection,refraction and diffraction

LIGHT WAVES

• You might think scientists know all the answers,but light continues to surprise them.
• We've always taken for granted that light travels faster than anything in the universe