Question

It is often illustrated in art, popular culture and everyday conversation that the Sun is Yellow. a. Using Wien’s Law and what you learned in class about the Sun’s temperature, explain why this is not true in reality. (20 points) b. In reality, what is the Sun’s true color? Why is this true? (20 points)

Answer 1

a) surface λ = 5 10⁻⁷ m

nuecleus λ= 2,890 10⁻⁹ m

there is a mixture of wavelengths giving rise to white light

b) True color sun is White

Step-by-step explanation:

Wien's law establishes a relationship between the temperature of a star and the maximum wavelength emitted

λ T = 2,898 10⁻³

if we calculate the wavelength of the Sun

T = 5800K λ = 5 10⁻⁷ m = 5000 nm

this is the surface temperature

in the part of the internal Sunspart (Nucleus) about 10⁶ degrees this is where the nuclear reaction occurs

in this region the photons are very short λ

λ = 2,890 10⁻³ / 106

λ= 2,890 10⁻⁹ m

these photons are absorbed and emitted on their way to the surface of the sun many times, therefore there is a mixture of wavelengths giving rise to white light

b) Sunlight when it reaches Earth is absorbed by atmospheric gases, mainly Blue, as it is absorbed by Nitrogen, it lets through mainly red and red

True color sun is White