Light Waves and Colour

• The image below shows the order of colours in the visible light spectrum. Which colour is missing?

  Blue

  
• The image below shows the order of some of the colours in the visible light spectrum. Which colour has the highest frequency?

  Violet

  
• The diagram below shows some notes played on a flute. Did sound 2 or sound 4 have the bigger amplitude?

  2

  
• The image below shows the order of some of the colours in the visible light spectrum. Which colour has the lowest frequency?

  Red

  
• Which colour absorbs all colours of light?

  Black
• Are sound waves transverse or longitudinal?

  Longitudinal
• Which is the angle of reflection?

  C

  
• Which line is the correct incident ray?

  B

  
• The diagram below shows some different notes produced by a flute. Which note is just as loud as note 1?

  3

  
• At night, a bat emits a series of sounds which bounce off objects and then return to the bat. The bat uses these to work out the location of objects, and so can avoid them. What is the name of this method used by the bat?

  Echolocation
• Which diagram correctly shows a reflected ray?

  A

  
• What is the name of the units used for frequency?

  hertz (hz)
• Which line is the correct reflected ray?

  C

  
• What name is commonly given to the reflection of a sound?

  echo
• A white light is directed at a green filter. Is green light absorbed by the filter?

  No
• What is the name of the dotted line labelled A?

  Normal

  
• The more energy a sound wave carries, the louder the sound and the bigger its... what?

  amplitude
• True or false? Sound waves cannot be reflected.

  False
• What colour objects reflect all colours of light?

  White
• Which is the angle of incidence?

  B

  
• What is frequency?

  The number of waves that pass by each second.
• Waves transfer energy from one place to another but they do not transfer any particles or matter, only energy.
• Transverse waves means that they are made with a vibration or oscillation at right angles or perpendicular to the direction of the energy.
• Amplitude is the height or depth of the wave.
• The peak or the crest is the highest point of the wave.
• The wavelength is the length of one complete wave.
• Pressure waves are made with a vibration or oscillation in the same direction as the energy transfer.
• Pressure waves are also known as longitudinal waves.
• Transmit is allowing the light to pass through.
• Translucent is objects that transmit light but scatter the light as it passes through.
• Transparent is objects that transmit light and you can see through them.
• Opaque is objects that absorb, scatter light so it does not pass through.
• Emit means to give out.
• Luminous is an object that emits light.
• Reflect is to bounce off the surface of an object.
• Diffuse reflection is when light is reflected in many different directions because the object is not smooth.
• Specular reflection is when light is always reflected at the same angle as what it enters.
• The law of reflection states: Angle of incidence = Angle of reflection
• Light bends (refracts) as it changes material through which it travels. The bending or refracting is determined by the different densities of the materials the light passes through.
• As the light enters the glass block, the material is more dense (particles closer together), which slows the light down. This causes it to refract towards the normal (the angle gets smaller).