earth’s surface receives most of its energy in short The energy received by the earth is known incoming solar radiation which in short is termed as The insolation received at the surface varies about 320 Watt/m2 in the tropics to about 70 in the poles. Therefore, the total amount of received at the equator is roughly about 5 of that received at the poles. Hence option (a) is correct. is frequently referred to as shortwave it falls primarily within the ultraviolet and portions of the electromagnetic spectrum and predominantly of wavelengths of 0.39 to 0.76 Radiation emitted from Earth is called radiation; it falls within the infrared portion the spectrum and has typical wavelengths of 4 to 30 Hence option (b) is not correct. atmosphere is largely transparent to shortwave radiation. The incoming solar radiation passes the atmosphere before striking the earth’s Within the troposphere water vapor, ozone and gasses absorb much of the near infrared vapor is the most abundant greenhouse gas in Earth's atmosphere, and it has strong absorption in the infrared portion of the spectrum. As infrared radiation passes the atmosphere, water vapor molecules can and re-emit a significant portion of the longwave Hence option (c) is the correct answer. waves are not part of the visible spectrum of waves in solar radiation. The visible refers to the range of electromagnetic waves are visible to the human eye, which includes between approximately 400 to 700 Infrared waves have wavelengths longer approximately 700 nanometers. Most of the emitted by a moderately heated surface is Hence option (d) is not correct.