Tyndall Effect – Why does the sky appear blue? | #aumsum #children #science #education #children
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Subject: Tyndall effect
Why does the sky appear blue?
It's such a beautiful rainbow.
Have you ever wondered how it is formed?
A rainbow forms when raindrops divide sunlight into different colors.
Sunlight or white light is made up of several colors.
However, only a few of them are visible to us.
A band of these visible colors is called the visible spectrum.
When we see a rainbow, our brain and eyes distinguish the visible spectrum into seven main colors, namely red, orange, yellow, green, blue, indigo and violet.
Hey.
Have you noticed that the size of the balls has increased?
Yes, you guessed right.
The balls represent the different colors of a rainbow in increasing order of their wavelengths.
Wavelength is the distance between consecutive crests or troughs of a wave.
In a rainbow, as you go from purple to red, the wavelength of the colors increases.
Violet has the shortest wavelength while red has the longest wavelength.
Do you think our eyes have a natural inclination towards blue rather than purple?
Yes, this is one of the reasons why our skies appear blue and not purple.
To understand this, let's first study the Tyndall effect.
The Tyndall effect is a phenomenon in which a beam of light disperses by striking particles in its path.
This diffusion of light is responsible for the blue color of the sky.
We know that our atmosphere is mainly composed of oxygen and nitrogen particles as well as dust, smoke and other particles in comparatively smaller proportions.
The size of these particles in the atmosphere is responsible for the color of the scattered light.
When sunlight hits particles of dust, smoke, etc., which are larger than the wavelength of sunlight, all colors of sunlight are equally scattered.
As a result, the scattered light appears white.
However, when sunlight hits particles of oxygen and nitrogen that are smaller than the wavelength of sunlight, since the colors of sunlight have shorter wavelengths, it i.e. blue and violet, are much more dispersed than colors with longer wavelengths.
But our eyes are much more sensitive to the color blue than to violet, which is why the sky appears blue to us.
Why does the sky appear blue?
It's such a beautiful rainbow.
Have you ever wondered how it is formed?
A rainbow forms when raindrops divide sunlight into different colors.
Sunlight or white light is made up of several colors.
However, only a few of them are visible to us.
A band of these visible colors is called the visible spectrum.
When we see a rainbow, our brain and eyes distinguish the visible spectrum into seven main colors, namely red, orange, yellow, green, blue, indigo and violet.
Hey.
Have you noticed that the size of the balls has increased?
Yes, you guessed right.
The balls represent the different colors of a rainbow in increasing order of their wavelengths.
Wavelength is the distance between consecutive crests or troughs of a wave.
In a rainbow, as you go from purple to red, the wavelength of the colors increases.
Violet has the shortest wavelength while red has the longest wavelength.
Do you think our eyes have a natural inclination towards blue rather than purple?
Yes, this is one of the reasons why our skies appear blue and not purple.
To understand this, let's first study the Tyndall effect.
The Tyndall effect is a phenomenon in which a beam of light disperses by striking particles in its path.
This diffusion of light is responsible for the blue color of the sky.
We know that our atmosphere is mainly composed of oxygen and nitrogen particles as well as dust, smoke and other particles in comparatively smaller proportions.
The size of these particles in the atmosphere is responsible for the color of the scattered light.
When sunlight hits particles of dust, smoke, etc., which are larger than the wavelength of sunlight, all colors of sunlight are equally scattered.
As a result, the scattered light appears white.
However, when sunlight hits particles of oxygen and nitrogen that are smaller than the wavelength of sunlight, since the colors of sunlight have shorter wavelengths, it i.e. blue and violet, are much more dispersed than colors with longer wavelengths.
But our eyes are much more sensitive to the color blue than to violet, which is why the sky appears blue to us.
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