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Transcript of Standard 4
Objective- S8P4. Students will explore the wave nature of sound and electromagnetic radiation.
Describe how the behavior of light waves is manipulated causing reflection, refraction, diffraction, and absorption.
Explain how the human eye sees objects and color in terms of wavelengths.
students will describe how the behavior of waves is affected by a medium. (air, water, solids)
EQ- Where can you find Standard Four in your everyday life?
Identify the characteristics of electromagnetic and mechanical waves.
A Wave is a periodic disturbance in a solid, liquid, or gas as energy is transmitted through a medium.
A Medium is a physical environment in which phenomena occur.
Electromagnetic Waves consist of electric and magnetic fields that vibrate at right angles to each other.These waves do not need a medium to transfer.
Mechanical Waves need a medium.
Light is an example of an electromagnetic wave.
Water and sound are an example of mechanical wave.
Relate the properties of sound to everyday experiences.
Diagram the parts of the wave and explain how the parts are affected by changes in amplitude and pitch.
Real World Examples
In order from long to short wavelength/low to high frequency:
Radio Waves (Radio and TV stations broadcast these)
Microwaves (Cook food with them and send information over long distances)
Infrared (the more it has infrared, the more higher the temp is)
Visible Light (the only EM division which the human can see. The longest wavelengths are red and the shortest are violet)
Ultraviolet (these are produced by the sun which damages the skin and can let the body absorb vitamin D)
X rays (used for medical reasons; cannot penetrate lead)
Gamma Rays (produced by some nuclear reactions)
Waves Through Solids, Liquids, and Air.
Substandard E and Substandard F
is the distance from any point of a wave to an identical point on the next wave.
is the number of waves produced in a given amount of time
is a measure of how high or low aq sound is perceived to be, depending on the frequency of the sound wave
is the maximum distance that the particles of a wave’s medium vibrate from their rest position.
is the complete back-and-forth motion of an object
A region of high density and pressure is called a
A region of low pressure and density is called a
Talking with each other
face to face.
Reflection is the bouncing back of a ray of light, sound, or heat when the ray hits the surface that it does not go through.
Refraction is the bending of a wave as the wave passes between two substances in which the speed of the waves differ.
Diffraction is a change in the direction of a wave when the wave finds an obstacle or an edge such as an opening.
Interference is the combination of two or more waves that results in a single wave
Constructive interference happens when the crests and troughs of one wave overlap the crests and troughs of another wave. This creates a larger amplitude which creates a louder sound.
Destructive interference happened when the crests of one wave overlap with the troughs of the other wave. This creates a smaller amplitude making a quieter/no sound.
There are three types of waves:
(moves perpendicularly to the direction the wave is going)
(the particles of a median vibrate parallel to the direction of wave motion
(combination of transverse and longitudinal)