Question

A planet is orbiting a star. What is relation between Ta and Tb, given that the arc subtended on the path by the planet is same in both cases?

(a) Ta = Tb

(b) Ta < Tb

(c) Ta < Tb

(d) Insufficient information

I had been asked this question during a job interview.

Question is from Cosmology topic in chapter Quantum Physics of Engineering Physics I

Answer 1

Right option is (b) Ta < Tb

The best explanation: The closer the planet will be to the star, the higher will be its speed and the sooner it will cover the distance. The planet sweeps equal area in equal time intervals. As the area swept by B is higher, Ta > Tb.