7. The following three statements give possible reasons why the average intensity of sunlight incident on a solar panel during a day on earth is only a fraction of the solar constant.
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| I. |
Scattering of sunlight in the atmosphere |
| II. |
Rotation of the earth |
| III. |
The surface of the solar panel is not perpendicular to incident of sunlight |
Which of the statements are correct?
D
Explanation:
Statement I is correct. The scattering of sunlight returns part of the sunlight back to space, reducing intensity on the ground.
Statement II is correct. The rotation of earth causes day and night, reducing the time the solar panel is exposed to sunlight and also changing the incident angle of sunlight on the panel.
Statement III is correct. The intensity on the solar panel is maximum when its surface is perpendicular to incident sunlight, but due to the seasons, the time of day and the installation angle of the panel the sunlight will not be normally incident on the panel.
Thus, D is the answer.