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Sun is a

What is the escape speed of the Sun ?

The nature of sun’s spectrum is

Plants require sun light for their

A new unit of length is so chosen that the speed of light in vacuum is unity. What is the distance (in this new unit) between the sun and the earth if light takes 8 min and 20 second to reach the earth from the sun?

Assume that the sun rotates about an axis through its centre and perpendicular to the plane of rotatin of the earth about the sun. The appearange of the sun, from any one pont on the earth, is shown. Light belonging to a particular spectral line, as received from the points A, B, C and D on the edge of the sun, are analyzed