Give a reason to show that microwaves are better carries of signals for long range transmission than radio waves.

Give reasons to show that ammonia is a compound.

Give reasons : Alkyl halides are better solvents than aryl halides.

Why do we use geostationary satellites for long distance transmission of T.V. signals?

What is the meaning of the terms frequency of an altrnating current? What is its value in India? Why is an alternating current considered to be advntageous over direct current for long range transmission of electric energy?

Why are dnger signals red in colour?Give reason.

Give reasons: Actinoids show irregularities in their electronic configurations.