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A main sequence star has mass 2×1031 kg and radius 3×109 m. Obtain an estimate of the average temperature throughout the star. Examine if Newton’s theory would be adequate for the study of this star.
Calculate the ratio of temp of stars1 wih absolute magnitude_3and radius_72and star 2 with magnitude 8and radius 6
When it is winter in the northern hemisphere, explain the position of the earth relative to the sun
An electron is moving with a speed of 0.97c in a magnetic field of strength 108 G. Calculate the peak frequency at which the electron will radiate.
With the help of the clear and labelled diagrams show the change of seasons on earth resultant from the tilt of its axis of rotation.
what do galaxies and the material existing between make up
An electron is moving with a speed of 0.97c in a magnetic field of strength 10^8 G. Calculate the peak frequency at which the electron will radiate.
The mean distance of Mars from the Earth is 0.5 AU and its orbital period is 687 days. Calculate the orbital period of Jupiter given that its mean distance from the Earth is 4 AU.
Explain the meaning of a degenerate gas. A white dwarf star has a mass of 1030kg. Its luminosity is 1024 Js^−1. Calculate how long it can survive with its present luminosity if its internal temperature is 107K.
If the temperature of the background radiation today is 3 K, at what time after the birth of the universe was the temperature 1015 K. Take the age of the universe as 15×109 years.
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