Solar Radiation and Atmospheric Effects Quiz
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Questions and Answers

What is the term for the sun's apparent location in the sky east or west of true south?

  • Declination angle
  • Altitude angle
  • Azimuth angle (correct)
  • Zenith angle
  • Which angle defines the off-south position in the horizon?

  • Solar declination
  • Azimuth angle (correct)
  • Zenith angle
  • Altitude angle
  • What determines the height of the sun above the horizon?

  • Azimuth angle
  • Altitude angle (correct)
  • Solar declination
  • Zenith angle
  • When does the shortest solar day typically occur for places in the northern hemisphere?

    <p>Around December 21 (winter solstice)</p> Signup and view all the answers

    During which phenomenon should the length of the day be theoretically equal to the length of the night?

    <p>Spring equinox</p> Signup and view all the answers

    What is the angle formed between the plane of the equator and a line drawn from the center of the sun to the center of the Earth called?

    <p>Solar Declination</p> Signup and view all the answers

    During which celestial event is the declination angle equal to 0?

    <p>Spring Equinox</p> Signup and view all the answers

    What is the angle between the sun and the local horizon directly beneath the sun known as?

    <p>Altitude Angle</p> Signup and view all the answers

    In terms of its reference, when is the azimuth angle positive?

    <p>When the sun is in the east</p> Signup and view all the answers

    What causes the seasonal variation of the solar declination angle?

    <p>Axial Tilt of Earth</p> Signup and view all the answers

    What is the declination angle denoted by?

    <p>δ</p> Signup and view all the answers

    At what point is the Earth nearest the sun during its orbit?

    <p>Perihelion</p> Signup and view all the answers

    What is the tilt equal to for the highest average insolation on a PV module?

    <p>Latitude</p> Signup and view all the answers

    Which of the following days marks the summer solstice?

    <p>June 21</p> Signup and view all the answers

    What would be the variation in distance on July 4 from the aphelion point?

    <p>$152 - 4$ million kilometers</p> Signup and view all the answers

    What is the typical unit for peak sun hours?

    <p>MJ/m²</p> Signup and view all the answers

    Which type of radiation reaches the earth surface directly from the sun?

    <p>Direct radiation</p> Signup and view all the answers

    What represents the sum of direct and diffuse radiation in solar radiation components?

    <p>Global solar radiation</p> Signup and view all the answers

    If the Air Mass is 1.5, what are the values of h1 and h2?

    <p>h1=1, h2=1.5</p> Signup and view all the answers

    What is the term used to describe the sun's height above the horizon?

    <p>Altitude Angle</p> Signup and view all the answers

    What is the relationship between solar declination, latitude, and zenith angle?

    <p>Solar declination is directly proportional to latitude and inversely proportional to zenith angle</p> Signup and view all the answers

    How does the altitude angle of the sun change throughout the day at a specific location?

    <p>It reaches its peak at noon and then decreases</p> Signup and view all the answers

    How does the seasonal variation of solar declination affect solar radiation at different latitudes?

    <p>It causes a decrease in solar radiation at higher latitudes</p> Signup and view all the answers

    How does the azimuth angle relate to the orientation of a solar panel?

    <p>Azimuth angle determines the direction a solar panel faces</p> Signup and view all the answers

    How does the altitude angle of the sun at solar noon compare at different latitudes?

    <p>It is highest at lower latitudes</p> Signup and view all the answers

    What is the astronomical unit (AU) used for in the solar system?

    <p>Measuring the average distance between Earth and the sun</p> Signup and view all the answers

    What is the estimated travel time for photons released in fusion reactions at the sun's core to reach the surface?

    <p>Thousands of years</p> Signup and view all the answers

    What is the speed at which solar radiation travels?

    <p>186,000 mi/sec</p> Signup and view all the answers

    How much energy from the sun hits the Earth every hour?

    <p>430 quintillion Joules</p> Signup and view all the answers

    What does solar insolation refer to?

    <p>The intensity of solar radiation reaching a given area</p> Signup and view all the answers

    What is the term for the angle between the sun and the local horizon?

    <p>Altitude angle</p> Signup and view all the answers

    Which angle defines the sun's position north or south of the equator?

    <p>Solar declination</p> Signup and view all the answers

    What causes the seasonal variation of solar declination?

    <p>Earth's tilt relative to its orbit around the sun</p> Signup and view all the answers

    In which phenomenon does the sun have its highest altitude and lowest daily path length for an observer at 0° latitude?

    <p>Summer solstice</p> Signup and view all the answers

    What is the name for the angle that defines the sun's compass direction in the sky?

    <p>Azimuth angle</p> Signup and view all the answers

    At what angle are the rays of the sun most intense for an observer at equator during the equinoxes?

    <p>$90^{\circ}$</p> Signup and view all the answers

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