experiment#6 by bayot,lim,uy

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

experiment#6 by bayot,lim,uy

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