Question

explain the the phenomenon responsible for the change in colour and also state the factors responsible for it ​

Answer 1

Answer:

The phenomenon due to which white light splits into seven colours on passing through a prism is called dispersion. White light is made up of seven bands of colors each having different wavelengths. Upon passing through a medium, each of the colors travels at different speeds and hence has different angles of refraction leading to the splitting of the light i.e. dispersion.

Answer 2

CORROSION:

The phenomenon involved in the above picture is corrosion also known as rusting of iron.

• This is a common phenomena and many metals go through corrosion.
• This happens when metals turn into oxides, hydroxides or sulphides.
• It is an irreversible process but it can be prevented by a few techniques like painting, galvanization etc.

FACTORS RESPONSIBLE FOR CORROSION:

• Exposure of metals to gases like carbon dioxide, sulphate etc.
• Increase in temperature
• Presence of salt
• Presence of acid