1. Waves L.O. To describe the transfer of energy by waves To use the Keywords associated with waves To calculate any of the three quantities associated with waves

2. Starter 1Write down a definition for Transverse Waves and Longitudinal Waves 2Complete the activity labelled starter on the worksheet. You have 5 min

3. Task Using pages 216 and 217 Complete the worksheets You have 10 min http://www.youtube.com/watch?v=VtmFvHeFpVs 3:50 min http://www.youtube.com/watch?v=U8XcPOvKdvA

4. Q4 from the Book

5. Worked Example Questions 1 What is the Wave Speed (v) if:- a)X = 40m, t = 2s b)X = 35m, t = 0.5s 2 What is the time (t) if:- a)X = 8m, v = 4m/s b)X = 10m, v = 50m/s 3 What is the Wave Speed if:- a)λ = 10m, f = 100Hz b)λ = 6m, f = 200Hz 4 What is the frequency if:- a)λ = 2m, v = 2000m/s b)λ = 4m, v = 800m/s Follow on task:- Complete Q4 from P217 Extension:- 3The wavelength of a sound wave is 2.8 cm. Calculate the frequency of the waves in hertz. 4Convert the following wavelengths into metres: aa radio wave of wavelength 3.5 km ba microwave of wavelength 5 cm ca sound wave of wavelength 120 mm. 5Ripples on the surface of water are noticed to travel 560 cm in 54 seconds. Calculate the speed of these waves in metres per second. 6aUse your answers from question 4 to calculate the frequency of each of the three waves. bFrom question 4, identify which are longitudinal waves and which are transverse waves. The units needed for wave calculations are metres, seconds, metres per second and hertz. 1 kHz = 1000 Hz 1 MHz = 1 000 000 Hz 1 m = 100 cm = 1000 mm.

6. Written Question Surfers like to have a long ‘fetch’ (Distance over which the waves have been formed), the longer the fetch the bigger and more powerful, and faster the ride. Explain using as much detail as possible how a surfer might calculate the wave speed. Include information on two ways that this could be done. Include working using estimated values

7. Marking Reference to Counting Waves as they pass a particular point to determine frequency Estimating or measuring the distance between wave crests Using numbers generated to calculate Wave speed Timing surfer over a known distance to determine distance and time quantities for calculations Reference to correct units Working present using e.g. numbers