Waves

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Waves

• S8P4 Students will explore the wave nature of
  sound and electromagnetic radiation.

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ENDURING UNDERSTANDINGSStudents will understand
that

• Energy is neither created nor destroyed it can
  be transformed from one form to another.
• Waves carry energy.
• Mechanical waves are created when a source of
  energy causes a medium to vibrate.
• Waves can change direction (refract, diffract,
  and/or reflect) when they encounter matter.

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• The energy of the wave changes as it travels from
  one medium to another.
• The wavelength and amplitude determines the
  characteristics of waves.
• The pitch of a sound wave is related to its
  frequency and its intensity is related to its
  amplitude.
• The characteristics of waves are affected by the
  type of medium.
• The colors observed by the eye are the result of
  the multiple wavelengths reflected by the object.

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Identify the characteristics of electromagnetic
and mechanical waves.

• Electromagnetic waves
• Can travel through a vacuum
• Radiation is the transfer of energy in the form
  of EM waves
• EM waves can interact with mediums (absorption,
  reflection, diffraction, refraction)

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• Electromagnetic Spectrum
• An EM waves frequency determines the waves
  characteristics.
• The higher the frequency, the more energy the
  wave carries.
• Radio waves are long, low-energy EM waves
• Infrared, visible, and ultraviolet light have
  mid-range wavelengths and frequencies
• X-rays and gamma rays have short wavelengths and
  high frequencies. High-energy waves.

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• Mechanical Waves
• Travel through a material, called a medium,
  transferring energy
• The medium moves as the wave passes through it,
  but returns to its former position after the wave
  passes
• Transverse wave- travels in the direction
  perpendicular to the disturbance that caused it
• Ocean wave, seismic wave, rope wave
• Longitudinal wave- travels in the same direction
  as the disturbance that caused it
• Sound wave, slinky wave when laying flat

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Describe how the behavior of light waves is
manipulated causing reflection, refraction,
diffraction, and absorption.

• EM waves can interact with material mediums in
  the same way as mechanical waves do.
• reflection, refraction, and diffraction.
• Objects that transmit most of the light that
  strikes them appear transparent.
• Objects that transmit some of the light that
  strikes them but cause it to scatter appear
  translucent.
• Opaque objects do not transmit light.

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Explain how the human eye sees objects and colors
in terms of wavelengths.

• Visible light reflected from an object gives it
  color
• a green leaf reflects green wavelengths and
  absorbs all other visible wavelengths.

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Describe how the behavior of waves is affected by
medium (such as air, water, solids).

• Since waves move through matter (a medium) the
  arrangement of the particles affects the speed at
  which it travels
• Waves move faster through solids
• Waves move slower through gases such as air

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Relate the properties of sound to everyday
experiences.

• High frequency sound waves create a higher pitch
  sound
• Lower frequency sound waves create a low pitch
  sound

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Diagram the parts of the wave and explain how the
parts are affected by changes in amplitude and
pitch.
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• Pitch is associated with the frequency of a sound
  wave- the higher the frequency, the higher the
  pitch.
• Loudness and Energy level is associated with
  amplitude- the higher the amplitude the more
  energy or louder the sound