Q. With reference to the solar radiation, which of the following statements is/are correct?
1. Earth receives energy from sun through short wavelengths.
2. Due to the shape of geoid of earth the sun’s rays fall obliquely at the top of the atmosphere and the earth intercepts a very small portion of the sun’s energy.
Select the correct answer using the codes given below:

[A] 1 only

[B] 2 only

[C] Both 1 and 2

[D] Neither 1 nor 2

Answer: C
Notes:

The earth’s surface receives most of its energy in short wavelengths.  

  • The energy received by the earth is known as incoming solar radiation which in short is termed as insolation.  
  • As the earth is a geoid resembling a sphere, the sun’s rays fall obliquely at the top of the atmosphere and the earth intercepts a very small portion of the sun’s energy.  
  • On an average the earth receives 1.94 calories per sq. cm per minute at the top of its atmosphere. 

Source: NCERT Fundamentals of Physical Geography