Advertisements
Advertisements
Question
Why does the sun appear red at sunset?
Solution
At sunset, the sun is near the horizon; hence, sunlight has to travel a longer distance through the atmosphere to reach us. During this journey, most of the blue colour present in sunlight, which has a shorter wavelength, gets scattered from our line of sight. Thus, the red colour present in sunlight, which has a longer wavelength and gets scattered the least, reaches our eye. As we see red colour everywhere overhead, the sun and the surrounding sky appear red at sunset.
APPEARS IN
RELATED QUESTIONS
What is meant by scattering of light? Use this phenomenon to explain why the clear sky appears blue or the Sun appears reddish at sunrise.
With the help of scattering of light, explain the reason for the difference in colours of the Sun as it appears during sunset/sunrise and noon.
How many colours are there in a full spectrum of white light? Write the various colours of spectrum in the order, starting with red.
Name some everyday objects:
which reflect all the colours in sunlight
Explain why, if we look at objects through the hot air over a fire, the objects appear to be moving (or shaking) slightly.
What is the colour of the sunlight:
scattered by the dust particles in the atmosphere?
In an experiment to study the scattering of light by passing a beam of white light through a colloidal solution of sulphur in a transparent glass tank:
Which colour is observed from the front of the glass tank? Does this colour correspond to the colour of sky on a clear day or the colour of sky around the sun at sunset?
What is meant by advance sunrise and delayed sunset? Draw a labelled diagram to explain these phenomena.
Twinkling of stars is due to atmospheric
Why is the colour of the clear sky blue?
