Ripple tank

• State the apparatus needed for this practical ?

  .ripple tank

  .lamp

  .power pack

  .water

  .white paper

  .vibrate bar
• Why do we use a lamp in this practical ?

  so we can reflect light on the paper and create the image of the waves
• Why is it useful to record the waves using a phone ?

  .we can freeze the images and playback speed
• how do we measure the wave length?

  .put a ruler next to the paper

  .freeze the image of waves

  .measure one wave and 10 waves further

  .divide the length by 10 to find one wave
• How do we find the frequency of wave ?

  .we place a timer near the paper

  .count the number of waves every 10 seconds then divide by 10
• how do we calculate the wave speed ?

  .frequency x wavelength