Question

Solar energy is due to
A. Fusion reactions
B. Fission reaction
C. Combustion reaction
D. Chemical reaction.

Answer 1

Hint: Solar energy is one type of energy. Solar word itself has meaning. Solar means sun which is a renewable source of energy. We use solar energy to get electrical energy. Fusion and fission is a reaction which comes under nuclear physics.

Complete step-by-step answer:
Solar energy is generated by the sun. Solar energy is useful for humans either directly or indirectly.
Solar energy us due to nuclear fusion reaction. Fusion energy takes place when protons of hydrogen atoms harshly collide in the Sun's core and fuse which created a helium atom.
In the fusion reaction process a proton and proton chain reaction shorted as PP, emits an enormous amount of energy. To provide continued energy and heat, PP chain reaction occurs with stars which have the same size as that of the sun. The temperature of these stars are measured on the Kelvin scale.
Stars which are bigger than stars create energy by driving the CNO cycle. This cycle converts hydrogen to helium.
Nowadays less than 2% of solar energy is created by the CNO cycle.

Additional information:
Fission reaction: It is a radioactive decay process. In this process two or more nuclei of atoms split into two or more than two nuclei. Tremendous amount of energy is released from this reaction.
Combustion reaction: In this reaction a substance reacts with oxygen and releases energy in the form of light and heat.
Chemical reaction: A process in which rearrangement of the molecular or ionic structure of a substance, as distinct from a change in physical form or a nuclear reaction.
Answer- (A)

Note: We know that light is nothing but electromagnetic energy. Basically electromagnetic wave carries energy heat and light. Majority of EM waves are invisible to us. Most of the harmful rays are completely absorbed by earth’s atmosphere.