Question

Explain the reddish appearance of sky at sunrise and sunset?

Answer 1

According to Lindberg

R is directly proportional to 1/λ⁴ where R is the rate of dispersal of any colour and λ is the wavelength of the colour. This was corrected by Raman where the wavelength of emergent is different from that of the original ray.

Since Violet, Indigo and Blue colour has short wavelengths, they disperse first and sky appears blue.

But at the time of sunset and sunrise, sun is farthest from Earth. Since blue colour has already dispersed on the path, so what we see is a mixture of green, yellow, orange and red colours with red having maximum proportions.

This is because red has maximum wavelength followed by orange, yellow ans so on.

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Answer 2

Answer:

ExPhase difference ϕ =  π/4 radian

Frequency  f = 50 Hz

Time difference Δt = ϕ/(2πf)

                            = π/(4 x 2π x 50)

                            = 1/(400)

                            = 0.0025 s

                            = 2.5 msplanation: