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प्रश्न
What is meant by advance sunrise and delayed sunset? Draw a labelled diagram to explain these phenomena.
उत्तर
The Sun appears about two minutes before the actual sunrise and this phenomenon is known as advance sunrise. The Sun remains visible about two minutes after the actual sunset and this phenomenon is known as delayed sunset. The advance sunrise and delayed sunset happen due to atmospheric refraction.
Sunrise means rising of the Sun above the horizon and sunset means setting of Sun below the horizon. The diagram given below shows the actual position (A) and the apparent position (B) of the Sun relative to the horizon.
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संबंधित प्रश्न
Name the scientist who discovered that sunlight consists of seven colours.
Which phenomenon makes us see the sun:
a few minutes before actual sunrise?
The blue colour of sky is due to:
(a) refraction of light
(b) dispersion of light
(c) diffraction of light
(d) scattering of light
Explain why, when the sun is overhead at noon, it appears white, but when the same sun is near the horizon at sunset, it appears red.
Why does the sun appear red at sunrises and sunset?
A beam of blue, green and yellow light passes through the earth's atmosphere. Name the colour which is scattered the most.
To an astronaut in a space-ship, the earth appears ______.
Blue litmus is added to two test tubes A and B containing dilute HCl and NaOH. Answer respectively. In which test tube a colour change will be observed? State the colour change and give its reason.
In the atmosphere which colour of light gets scattered the least?
Is the position of a star as seen by us its true position? Justify your answer.
