Question

Sun is the ultimate source of energy for the earth.
A. true
B. false
C. ambiguous
D. data insufficient

Answer 1

Hint: Sun emits electromagnetic waves of over a wide range of wavelengths. These waves contain the infrared rays and the visible light. The energy from the sun can be converted into heat and electricity.

Complete step by step answer:
We already know that we receive heat from the sun. In the daytime, in the presence of the sun, we feel hot and at night when the sun rays do not reach us we do not feel that much heat as compared to the day time. This fact implies that we receive heat energy from the sun.
Actually, the sun emits electromagnetic waves, which travel through space and reach our earth. The electromagnetic waves make up a large spectrum of different wavelengths. The waves transferring the heat belong to the infrared region of the wavelength. These waves transfer electromagnetic energy, which we fill as heat. The spectrum also contains a range of wavelengths, which we know as the visible light. We can sense these waves and are able to see things. The light contains a wide range of wavelengths, which give different colours to the things that we see. Therefore, we receive heat and light energy from the sun.
The energy of the sun has become very useful for us. Many appliances work on solar energy, which is eco-friendly. Thus, use of solar energy will reduce pollution.
The solar energy can be used to produce heat and electricity. One of the best inventions is the solar cooker, which works only on solar energy and does not need any other means of energy. A solar cooker converts the solar energy into heat energy that heats the food. Solar panels are used to convert solar energy into electricity.
Hence, we can say that the sun is the ultimate source of energy.
Therefore, the correct option is A.

Note: Although the sun is the ultimate source of energy, we are still unsuccessful in using it completely. It still has a lot of potential. The solar planes used in producing electricity are made up of silicon. Silicon is rare and very expensive. Thus, setting up solar panels is very expensive.