CP4

• Name three different types of wave.

  Light, sound, and seismic waves
• What property of a wave does the wavelength describe?


  The distance from one wave to the same place on the next wave
• What are the units for wavelength?


  Metres
• What property of a wave does the frequency describe?


  The number of waves per second
• What are the units for frequency?


  Hertz
• What is transferred by a wave?

  Energy
• What does amplitude mean?


  The maximum displacement of a particle from its rest position
• In which direction do the particles in a sound wave move compared to the direction the wave is travelling?


  Backwards and forwards in the same direction as the wave
• What word is used to describe waves like sound waves?

  Longitudinal
• What word is used to describe waves like the waves on water?

  Transverse
• Name a type of transverse wave.


  Light waves
• Name a type of longitudinal wave.


  Sound
• What is the difference between longitudinal and transverse waves?


  The direction the particles move compared to the direction the wave is travelling
• What word describes the number of waves per second?

  Frequency
• What word describes the time taken for one wave to pass?

  Period
• What word describes the distance between a point on one wave and the same point on the next wave?

  Wavelength
• Name two things that waves can transfer.

  Energy and information
• Name one thing that waves do not transfer.

  Matter
• What is the difference between speed and velocity?


  Velocity has a direction as well as a magnitude
• What is the equation that links speed, distance and time?


  Speed = distance/time
• What is the equation that links wave speed, frequency and wavelength?


  Wave speed = frequency × wavelength
• What two things do you need to measure to find the speed of a wave?


  The time to cover a certain distance, or the wavelength and the frequency
• Describe the path of light when you watch TV.


  TV to eye
• Describe the path of light when you sit underneath a lamp and read a book.

  Lamp to book to eye
• What is the word that describes light bouncing off a material?

  Reflection
• What does refraction mean?


  Changing the direction of a wave
• When does refraction happen to light waves?


  When light goes into or out of a material
• Name three materials that light can travel through.


  Air, glass, and water
• Why is it difficult to see the exact positions of objects on the bottom of a swimming pool?

  Light is refracted as it leaves the water
• What is an interface?


  Boundary between two materials
• What is a normal line?


  A line at right angles to a surface/interface/boundary
• Describe the path of a light ray in air.


  Straight line
• What happens to light when it goes from air to glass?

  It refracts/changes direction
• When light goes from air to glass, which way does it bend?

  Towards the normal
• When light goes from water to air, which way does it bend?


  Away from the normal
• In which material does light travel faster, water or air?


  Air
• What happens to the speed of waves as they go into shallower water?


  They slow down
• What does transmit mean?


  When a wave passes through something
• What does reflect mean?


  When a wave bounces off something
• What do waves transfer?

  • Energy
  • Information