1 / 30

Day 13

Day 13. Sun Angle and Solar Heating Investigation 3 part 3. The tilt of Earth’s axis produces changes in day length over the course of a year. Review. Earth rotates on its axis to produce day and night. Review. Summer Solstice Occurs when the axis is angled toward the Sun. Winter Solstice

kbabb
Download Presentation

Day 13

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Day 13 Sun Angle and Solar Heating Investigation 3 part 3

  2. The tilt of Earth’s axis produces changes in day length over the course of a year Review Earth rotates on its axis to produce day and night

  3. Review SummerSolstice Occurs when the axis is angled toward the Sun Winter Solstice Occurs when the axis is angled away from the Sun Seasons are opposite in the Northern and Southern Hemisphere

  4. Questions • What kind of weather do you generally associate with summer? • What is it about summer that makes it hotter? • What happens to produce more heat?

  5. Answer? • Longer days • More time for the Sun’s energy to be absorbed by the: • Land • Water • Atmosphere But could there be more?

  6. Circle the brightest spot on the graph paper Light Model Observe the spot of light where the beam hits the floor To represent a beam of light from the Sun

  7. Form of energy The circles shows the area that the energy beam covered at two different times Light Both are sources of light energy

  8. Beam Spreading • Discuss the demonstration/lab in your group • Work together to answer the questions on page 13 of your lab book.

  9. Size and shape of the light spot changes, depending on the angle Observations Spot gets bigger as the angle between the beam of light and floor gets smaller • Amount of light energy in the beam stays the same • Both spots deliver the same amount of energy to the paper

  10. Light Energy Energy travels from the Sun to Earth as radiation Radiant energy travels in rays

  11. Solar Angle • Angle at which light strikes a surface Low solar angle rays hit the Earth’s surface at about 15˚ Light rays from directly overhead have a high solar angle

  12. Fewer rays hit an area = energy density is low Energy Density Number of rays hitting a given area is the energy density Lots of rays hit an area = energy density is high Notice rays are equally spaced in both beams But, because of solar angle Three times as many rays when it is s from a high solar angle

  13. Beam Spreading • The way a light beam covers a larger area when it hits a surface at an angle

  14. Penny Question • Answer the fourth question 90˚ 30˚

  15. Penny Question Answer Amount of energy hitting it varies with the solar angle Surface area of a penny does not change 90˚ 30˚ The greater the angle, the greater the energy it will receive

  16. Solar Angle and Earth Earth is round = the angle at which light hits it is different from place to place Sunlight Earth viewed as many flat surfaces Light strikes surfaces that are at different angles

  17. Solar Angle on Earth 30˚ Angle between the incoming rays of light and the surface of the land is the solar angle 45˚ Solar angle = 60˚ Solar angle = 90˚

  18. Sunlight on Earth’s Surface Light energy from the Sun is distributed over a larger area when it hits Earth’s surface at an angle Beam spreads more and more the farther north or south your go Does the same thing if you move east and west

  19. Afternoon Sun Energy is most intense High solar angleBeam spreading is small

  20. Morning and Evening Sun Energy is least intense Low solar angleBeam spreading is large

  21. The Results Solar energy most intense during the middle of the day in the tropics Energy is least intense in the morning, evening and extreme north and south regions

  22. Solar Energy • Almost all of the energy coming to Earth is solar energy • Light absorbed by the land, water, and air is converted to heat • Heat is the form of energy that makes things happen in the atmosphere

  23. Atmosphere activities What we call weather

  24. Beam Spreading • Answer question 5 • Solar angle influences how much energy is received in an area. A large solar angle means more energy per area on Earth’s surface. Smaller solar angles result in beam spreading, delivering less energy per area to Earth’s surface.

  25. Arrows and Symbols Visualization Exercise 3.3

  26. Angle of Sunlight and the Seasons

  27. Angle of Sunlight and the Seasons

  28. Angle of Sunlight and the Seasons

  29. Angle of Sunlight and the Seasons

  30. Angle of Sunlight and the Seasons = Approximate position of the United States

More Related