10y4 physics electricity/waves

Today we're going to finish the electricity section and start looking at waves. Answer the following:

1. What kind of fuel is being used to generate electricity here? Is it sustainable? - http://www.climatespectator.com.au/commentary/little-pig-went-carbon-market
2. How many kilometres of overhead powerlines are there in England and Wales? - http://www.emfs.info/Sources+of+EMFs/Overhead+power+lines/
3. Briefly explain how tidal power can be used to generate electricity - http://www.darvill.clara.net/altenerg/tidal.htm
4. What are waves? - http://www.bbc.co.uk/schools/gcsebitesize/science/aqa/waves/generalwavesrev1.shtml
5. Describe the main difference between mechanical and electromagnetic waves - http://www.physicsclassroom.com/class/waves/u10l1c.cfm
6.  Explain the difference between a longitudinal and a transverse wave - http://www.bbc.co.uk/schools/gcsebitesize/science/aqa/waves/generalwavesrev2.shtml
7. Explain whether this wave is mechanical or electromagnetic, and transverse or longitudinal (giving reasons why):                                       
8. Define wavelength - http://searchnetworking.techtarget.com/definition/wavelength
9. Try this activity, and make some notes on how renewable sources of energy are different to non-renewables - http://www.electrocity.co.nz/
10. Try this activity, and list some ways we can use less energy to help prevent climate change - http://www.bbc.co.uk/climate/adaptation/jack.shtml

REMEMBER THE HOMEWORK, YOU CAN START NOW IF YOU WANT.