What is specific heat capacity?
It takes 5000j to heat 50g of a substance by 40 degrees C . Calculate its specific heat capacity.
Explain why heating a pan of boiling water doesn't increase its temperature?
How much energy is needed to boil a dry pan of 500g of water to 100c
Briefly describe how heat is transferred through a) conduction b) convection and c) radiation
Describe how heat radiation is used to cook food a)under a grill b) in a microwave
Describe three ways of saving energy in the home and how each one works
How much energy is wasted in a hair dryer thats 20% efficient has a total energy input of 200 0000 j ?
Briefly describe what happens to a wave when its a) diffracted b) refracted
seven types of electro magnetic waves
Why is morse a code a digital signal
Explain how lasers are used in CD players ?
Explain how infa red radiation is used to control electrical equipment
Explain why long wave radio waves can bend around obstacles?
What happens to radio waves in the iron sphere ?
Give two disadvantages DAB ( Digital Audio Broadcasting)
Describe how satellites are used for communication ?
Why are scientists concerned about the danger of mobile phone usage and the thinning of the ozone layer?
Explain the difference between analogue and digital?
Why are CFC's so bad ?