Lesson 4 Whats the deal The Sun is one medium size star The Andromeda Galaxy is a cluster of hundreds of billions of stars most are larger than the Sun Why is the Sun so incredibly much brighter than the whole Andromeda Galaxy ID: 508352
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Slide1
How Light Spreads Out
Lesson 4Slide2
What’s the deal?
The Sun is one medium size star.
The Andromeda Galaxy is a cluster of hundreds of billions of stars*, most are larger than the Sun.
Why is the Sun so incredibly much brighter than the whole Andromeda Galaxy?
*710,000,000,000 solar masses according to Wikipedia.Slide3Slide4
What should I put in my data table?Slide5
Ideal Data (Don’t Change Yours)
Distance from Light Source
Area of Illumination
(Lit Area)
10 cm1 cm2
20 cm
4 cm
2
30 cm
9
cm
2
40 cm
16 cm
2
50 cm
25 cm
2Slide6
What kind of graph should we use?Slide7
Extrapolating:
Estimating beyond the measured/recorded data.
Distance from Light Source (cm)Slide8
Exponential RelationshipSlide9
Formula:
Area of Illumination = (Distance to Light Source/10)
2
y=(x/10)
2 Where y=Area of Illumination and x=Distance to the Light Source
Big idea:
As light leaves the source
the light
spreads out
and becomes
weaker (
less energy
) exponentially.