Q. 22

The energy from the sun reaches just outside the earth’s atmosphere at a rate of 1400 W m–2. The distance between the sun and the earth is 1.5 × 1011 m.

(a) Calculate the rate at which the sun is losing its mass.

(b) How long will the sun last assuming a constant decay at this rate? The present mass of the sun is 2 × 1030 kg.

Answer :

a)


The amount of energy radiated by the sun in


As the energy radiated is dependent on the surface area it covers which is given by


Energy loosed by the sun till it reaches earth in 1 second is given by


So, the mass loosed by the sun in 1 second is


b)


As the rate of decay of the mass is constant it will last up to


In years


Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Related Videos
Colligative Properties {Theory}34 mins
NCERT Exemplar Special | The Living World Part 225 mins
Wheatstone Bridge - Theory Class35 mins
Electric Flux - Theory46 mins
Exemplar Special Quiz | Reproductive Health Part 224 mins
Exemplar Special Quiz | Sexual Reproduction in flowering Plants Part 133 mins
Exemplar Special Quiz | Human Reproduction Part 232 mins
Exemplar Special Quiz | Reproductive Health Part 127 mins
Arrhenius equation & Collision Theory59 mins
Understanding the Combination of cells54 mins
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation
view all courses
RELATED QUESTIONS :