Question

give reason of the following :-
⚫ stars appear to be twinkle in sky.
⚫water kept in earthen pot become cool.
⚫we feel no pain while cutting our nails.
⚫sky appears blue during but reddish in evening.
⚫we use red colour in danger sing.

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Answer 1

Answer:

stars appear to be twinkle in sky?

Due to the effects of Earth's atmosphere, the stars twinkle in the night sky. When starlight enters the atmosphere, it is affected by winds in the atmosphere and by areas with different densities and temperatures. These are the causes due to which light from the star appears to twinkle when seen from the ground.

water kept in earthen pot become cool?

Water placed in earthen pots is evaporated from minuscule pores it has as it is made of mud particles. ... This evaporation of water produces a cooling effect. Some of the heat energy that is generated is used in the process of evaporation. Hence, water stored in earthen pots tends to become cooler in summer.

we feel no pain while cutting our nails?

We do not feel any pain when we cut our nails or hair because both nails and hair do not have nerves to send messages to the brain. They are dead cells.

sky appears blue during but reddish in evening?

A clear cloudless day-time sky is blue because molecules in the air scatter blue light from the sun more than they scatter red light. When we look towards the sun at sunset, we see red and orange colours because the blue light has been scattered out and away from the line of sight.

we use red colour in danger sign?

Danger signals are red in color because it is scattered the least by air molecules. ... Since the color red has the highest wavelength of all the colors we can see it scattered the least. So, red light is used as a danger signal as it is able to travel the longest distance through the fog, rain, etc.

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Answer 2

Answer:

• The sky is black in the night so the stars twinkle in the sky...
• The water keep the earth cooler
• we feel no pain while cutting nails because the nail is the top of skin
• afternoon in blue because the sun is coming to sett and in evening the sun will set completely
• The red is signal of danger because scattering least by air molecules

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