Path length of radiation through the atmosphere to the length of path when the sun is at zenith is called ___________(a) Declination(b) Air mass(c) Azimuth(d) Solar ConstantI had been asked this question during an interview.The query is from Solar Constant in section Solar Energy of Energy Engineering

Path length of radiation through the atmosphere to the length of path

1.	Path length of radiation through the atmosphere to the length of path when the sun is at zenith is called ___________(a) Declination(b) Air mass(c) Azimuth(d) Solar ConstantI had been asked this question during an interview.The query is from Solar Constant in section Solar Energy of Energy Engineering
Answer» CORRECT answer is (b) Air mass To ELABORATE: Path length of RADIATION through the atmosphere to the length of path when the sun is at zenith is CALLED Air mass. Air mass, m = COS (altitude angle), except for very low solar altitude angles. m = 1; When the sun is at the zenith m = 2; When zenith angle is 60^o m = 3; sec (θz) for m>3.

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