Where would you place hydroelectricity and wave energy ?

Compare and contrast biomass and hydroelectricity as sources of energy.

What do you mean by wave energy?

Is hydroelectric power a renewable source of energy?

What do you mean by photo electric effect? Calculate the energy of one mole of photons of radiations having wave length 200 nm.

What are the environmental consequences of the increasing demand for energy? What steps would you suggest to reduce energy consumption?

What would you observe when zinc is added to a solution of iron (II)sulphate?Write the chemical reation that takes place.

What do you mean by wave length?