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Why is the sun red?

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Haruka Ogawa

on 14 April 2015

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Transcript of Why is the sun red?

If you were told to draw a picture of the sunset...
You will probably draw a picture with
most of the picture colored
in red, orange and with some white.
Aim 10:
Making connections between physics and chemistry
Why is the sunset red?
Then why is the sunset
Compared to the distance of the sun at daytime, the distance of the sun at sunset is greater from where you stand. This means that the blue and green color of the sun scatters more in the longer distance, leaving the red color the most visible color by the time it reaches to your eyes. Therefore, we see the sunset as the color
How does our experiment work in the real world?
The three of us, Mitsuko, Kaori and Haruka brought materials for our model.
Kiley took the videos and photos.
We all cooperated to research the reasons for the redness during sunset and to create this prezi.
Physics involved in this project:
-learning about the mechanism of light, especially visible light
-making a model to demonstrate the color in the sky
"Why Is the Sky Blue?" :: NASA's The Space Place. N.p., n.d. Web. 10 Apr. 2015. <

"The Physics of Sunsets." Starts With A Bang. N.p., n.d. Web. 10 Apr. 2015. <

University of Cambridge. The Naked Scientists. Forecasting Weather and Climate. 9th April 2006. 10th April 2015.

"Do It Yourself | Causes of Color." Do It Yourself | Causes of Color. Web. 10 Apr. 2015. <
The sun emits light which we see as colors close to red, orange and yellow or even white.
However, if you shine light in a prism, you`ll see the colors of the rainbow.
Why is the sky blue in daytime?
In our experiment
1. Water and milk
 3. Milk consist droplets of fat in the water
This is because..
Bluish light appears on the side of the flashlight
The distance from the light source is short
When the distance from the light is short, only blue and green light come into our eyes
Blue is low frequency and the longer wavelength.
Red wavelength is not visible
But why is it that we can only see

even though the sun emits all these colors?
Orange light appears farther from the flashlight
The beaker is farther from the light source
Blue and green light is already scattered a lot. Only red wavelength is visible
Red is high frequency and the shorter wavelength
These colors,

, have different wavelengths, so by the time it hits our eyes to see, only colors such as




are visible.



wavelengths are still left and mixes with the

and creates the

color we see during sunset.
short wavelength and high frequency
long wave length low frequency
Rayleigh scattering
 happens when the radiation of lights collides with particles (ex. oxygen, carbon dioxide, dusts) which are much smaller than the wavelength of the light. The strength of light scattering is inversely proportional to the wavelength of light.

Milk (2 drops in each beaker)
Water (500ml in each beaker)
500ml Beaker (9 of them)
1. Fill the beaker with 500ml of water
2. Add few drops of milk
3. Mix it well
4. Place the beakers in a line
5. Make the room completely dark
6. Shine the flashlight from one side of the beakers
Chemistry involved in this project:
-Mixing solutions (milk and water)
-In deciding which concentration is effective in creating sunset
-tools used to make this model (beakers and measuring cylinders)
the sun
Work Cited
Aim 7: Our roles
Aim 8:Impact of our topic

Social impact:
Color appears to our eye by somehow: one method is Rayleigh scattering. According to the mechanism of Rayleigh scattering, more particles will scatter sunlight more. This means, polluted air (more particles) may enhances the beauty / the color of sunset.
Problem 1
Initially, our plan was to use a pet bottle to create the model of sunset, but once we experimented with the pet bottle, red/orange color did not clearly appear as much as we expected.
In our world
1. Atmosphere
2. Sunlight
3. Dust in the atmosphere

When the flashlight is on, the source of the light goes through the beaker. As you can see, the color is different in each beaker. The light hits the droplets of milk, the color of the light scatters. The color of the solution becomes orange in the beaker far from the flashlight. This is the same as the color of the sunlight when it hits the dust in the atmosphere.
We figured out that more distance from the source of light was necessary, so we redesigned our procedure and we ended up using 9 of 500ml beakers to have enough distance for the light to appear like the way we wanted to.
photo from dreamstime.com
photo from the website that we got the procedure of this model
Description of the experiment
Problem 2
First we used milk and water with a concentration of 5ml per 1L, but this solution didn't show any difference in the value of the color of the flash light as we wanted our model to show.
This concentration was the procedure for using 1L pet bottle as the container of model, so it was too high concentration to use for 500ml beaker.

So, we redesign the procedure again and finally we used the solution of 2 drops of milk per 500ml.
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