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give me one good and important question with solution

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Answer 1

HELLO DEAR FRIEND

IF YOU ARE 10TH THEN THIS QUESTION WILL HELP YOU.

Q• WHY DO STARS TWINKLE ?

==> STARS TWINKLE BECAUSE OF THE ATMOSPHERIC REFRACTIONS. THE LIGHT AGAIN AND AGAIN BENDS TOWARDS THE NORMAL BECAUSE DUE TO THE TEMPERATURE REFRACTIVE INDEX VARIES AND THE TEMPERATURE AT EVERY LAYERS OF THE ATMOSPHERE IS DIFFERENT SO REFRACTIVE INDEX CHANGES AND WE SEE THE APPARENT POSITION OF THE STARS AND CAN'T SEE THE REAL POSITION BUT THE TEMPERATURE OF THE ATMOSPHERE IS NOT SAME. IT VARIES VERY FAST BYTIME TO TIME DUE TO WHICH REFRACTIVE INDEX ALSO CHANGES BY TIME TO TIME AND APPARENT POSITION OF STARS ALSO CHANGES THIS PROCESS IS SO FAST THAT IT SEEMS TO STAR TWINKLING.

HOPE IT HELPS YOU DEAR FRIEND

THANKS

Answer 2

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Ques:What do you mean by Velocity ❓❓

Answer: Velocity is the rate of change of displacement with time .

It is a vector quantity .

Its unit is m/s

Its dimensional formula is

[M(0) L(1) T(-1)]

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