Download - Experiment#6 by Bayot,Lim,Uy
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7/28/2019 Experiment#6 by Bayot,Lim,Uy
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De La Salle University
College of Education
Science Education DepartmentPHY 583MEarth and Environmental Science
Experiment # 6INSOLATION AND THE SEASONS
Members: Bayot, Joysol
Lim, Perlita
Uy, Roxanne
Prof: Dr. Cecil Galvez
Class Period: Sat, 8:00 am11:00 am
Date performed: 4/6/13
Date submitted: 4/13/13
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I. INTRODUCTIONA. BACKGROUND INFORMATION/THEORY AND CONCEPTS
Insolation refers to the radiation from the sun or the solar energy that is received by the
Earth. The angle at which solar radiation strikes a surface dramatically influence the
amount of energy received by the surface of the Earth, that is why we have different
climate zones, seasonal temperature changes and daily temperature changes. Each time
the Earth rotate, the angle that is striking the surface changes. These changes in solar
radiation contribute to recurrent changes in weather.
In terms of Earths surface distance from the sun, the greater the distance that light travels
through the atmosphere, the more its energy is reduced by absorption and reflection by
particles in the air. More significantly, when the Sun is directly overhead, the solar rays
are most concentrated and great change in the temperature is observed.
B. OBJECTIVES
This activity aims to determine the relationship between the angle of incoming light and
the rate of change of temperature of the surface that absorbs the light.
C. HYPOTHESIS
If the surface is leaning perpendicular to the incoming light (90o), then the rate of
change of the temperature is higher.
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II. METHODSTART
SECURE MATERIALS
PREPARE SET-UP:
GLUE PIECE OF BLACK CONSTRUCTION PAPER TO THE TOP OF THE
15X15 CARD BOARDTAPE PROTRACTOR TO THE CENTER OF ONE EDGE
ATTACH TEMPERATURE SENSOR
ATTACH FINGER CLAMP TO THE ROD STAND
PLACE LAMP 30 CM AWAY FROM THE CARD BOARD
USE XPLORER GLX
POSITION CARBOARDS AT 90, 60 AND 30 DEGREES
START DATA RECORDING
RECORD TEMPERATURE CHANGE FOR 15 MINUTES
IS THE DATA
COMPLETE
AND N
ACCURATE?
Y
FIX SET UP
END
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III. Materials Used and experimental set-up
Small Tripod Base and Rod
Finger Clamp
Protractor
PASPORT Temperature Sensor
Cardboard with Black Construction Paper
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IV. DATAa. OBSERVATIONS in a DATA TABLE or CHART
Angle Initial
Temp,oC
Final Temp,oC Change in
Temp, Co
90o 25.5 68.3 42.8
60o 25.2 59.4 34.2
30o 24.9 48.4 23.5
Table 1.Temperature measurements at different angles of light
b. GRAPHS
Figure 1.Rate of heating at different angles
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Figure 2.Linear fit of each curve
c. CALCULATION:Change in temperature = Final temperature Initial temperature
V. ANALYSIS
What is the relationship between the rate of warming of a surface and the angle at which
radiation such as sunlight strikes the surface.?
The rate of warming a surface is higher as the sunlight is directly above the surface (900).
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VI. CONCLUSIONWhen the Sun is directly overhead, that is at 90, the solar rays are concentrated and
therefore at its maximum. The maximum insolation yields a great temperature
change on a surface. If the sunlight reaches the surface at a lower angle than 90, the
solar radiation is more diffuse. At an angle of 30, the insolation is only 50% as
much as the maximum.
VII. ANSWERS TO QUESTIONSAnalysis questions:
1. Which angle exposed the cardboard to the MOST solar radiation?Cardboard at 90
o
is the most exposed to solar radiation.
2. What angle exposed the cardboard to the LEAST solar radiation?Cardboard at 30
ois the least exposed to solar radiation.
Synthesis questions:
1. During which season of the year is the sunlight more direct for theNorthern Hemisphere?
In June 21, the Northern Hemisphere is leaning at 23.5 toward the Sun
called the summer solstice. On that day, the Northern Hemisphere
experiences direct rays of sunlight hence, the 24-hour period is mostly
daylight hours and the season is summer.
2. What relationship is there between the angle of insolation and thetemperature change?
When the Sun is directly overhead, that is at 90, the solar rays are
concentrated and therefore at its maximum. The maximum insolation
yields a great temperature change on a surface. If the sunlight reaches
the surface at a lower angle than 90, the solar radiation is more diffuse.At an angle of 30, the insolation is only 50% as much as the maximum.
3. Do your results support your prediction?Yes.
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4. What other factors affect the weather for a particular location on Earth?Other factors that affect the weather on Earth are the Earths rotation,
Latitude, Earths distance from the sun, angle of the axis of Earths
rotation and the energy through the atmosphere.
VIII. REFERENCES1. Williams, Trinklein, Metcalfe.Modern Physics, 1
stedition.1984
2. Cordero-Navaza and Valdes.Physics, 2nd
edition. 2001
3. Hewitt. Conceptual Physics. 2005