ghsgt review day 2 – describe the properties of a wave
TRANSCRIPT
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GHSGT Review
Day 2 –
Describe the Properties of a Wave
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What is a wave?
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Echos and Reflections
Sound waves that are reflected can cause an echo.
Mirrors can reflect light waves to give us reflected images.
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Properties of a wave
Wavelength – the length of a wave from peak to peakFrequency – the number of wave peaks that occur in a unit of time (measured in hertz, Hz)
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As the wavelength increases the frequency decreases.
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What do you know about light?
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Electromagnetic spectrum – made up of visible and invisible
waves of transverse energy waves, ranging from low frequency to very high
frequency, which can travel at the speed of light in a vacuum.
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Light waves are part of the electromagnetic spectrum. The frequency of a light wave determines its color.
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Why is a sunset more red?
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We could use mirrors to manipulate light waves…
• A flat mirror is a smooth shiny surface that reflects light. Light travels in a straight line as it is reflected from a surface. – The incident ray is the light ray that strikes
the surface. – The reflection ray is the light ray that reflects
off the surface. – The Law of Reflection states that the angle
of reflection equals the angle of incidence.
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REFLECTIONBouncing a ray or wave off a surface
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REFRACTIONis the bending of a wave or light by the
change in density of the medium
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Using lenses to bend light
Images in convex Images in concave mirrors are always mirrors are always smaller. bigger.
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Just a few more terms to review…
• Interference - the superposition of two or more waves resulting in a new wave pattern
•Diffraction - the bending and spreading of waves when they meet an obstruction.
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Special things to know about sound…
• cannot travel through empty space or a vacuum.
• Sound travels faster through solids than through liquids or gases.
• When temperature increases, the speed of sound increases.
• When the air becomes more humid, the speed of sound increases.