Question & Answer: Page 1

Ranjita asks : An astronmical telescope has an objective of focal length 200 cm and an eyepiece of focal length 10 cm . An observer ajusts the distance of the eyepiece from the objective to obtain the image of the sun on a screen 40 cm behind the eyepiece. The diameter of the sun’s image is 6.0 cm .Find the diameter of the sun. The average earth-sun distance is 1.5x 1011 m.

Tag : earthsun,observer,image,length,telescope,focal,eyepiece,objective,screen,obtain

Category : Class XI / XII | On : 2012-01-17 03:29:22

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Laxman goswami asks : Two spaceships are moving at a velocity of 0.9 c relative to the Earth in opposite directions. What is the speed of one spaceship relative to the other? (c = velocity of light)

Tag : light,opposite,relative,earth,speed,moving,spaceship,spaceships,velocity

Category : Civil Services (CSAT) | On : 2011-05-23 05:05:03

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Roshan rajkumar meshram says :

12/06/2011 09:00:43

speed of one spaceship is also 0.9

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Ashwin samudre asks : what is the mass of moon as compared to the earth

Tag : earth,moon,compared

Category : NTSE / Olympiad | On : 2010-11-14 10:07:02

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Neeraj lohade says :

21/01/2011 03:43:51

1/6

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Ashok kumar vunnam asks : when the earth was born?

Tag : born,earth,gate

Category : GATE | On : 0000-00-00 12:00:00

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Monika goel says :

00/00/0000 12:00:00

the earth was born around 100 yeras ago

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Ashok kumar vunnam asks : when the earth was born?

Tag : gate,earth,born

Category : GATE | On : 0000-00-00 12:00:00

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Manoja kumar pattanaik says :

00/00/0000 12:00:00

when you saw it first time that is your birth date.No body has an exact date of when the earth was born.Many scientists gave different theories but no one is perfect.so u can say it as since time immemorial.

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