B. It takes a ray of light 10.5 years to travel from Earth to Epsilon Eridani.
Explanation:
Light year is the unit of the distance between two points. It is defined as the distance traveled by light from one point to other for given interval of time.
So here if the distance is given as 10.5 light years then it means the distance between Earth and the given star is same as that the distance traveled by the light in 10.5 years.
So here we can say that distance is
so here the correct answer will be
B. It takes a ray of light 10.5 years to travel from Earth to Epsilon Eridani.
<span>The correct answer is B. - It would take a ray of light 10.5 light years to travel from Earth to Epsilon Eridani, or vice-versa. Using our current technology it would take far longer than 21.0 years for a space ship from Earth to travel that far - I would have to guess many hundreds of years.</span>
The value of acceleration due to gravity is greater in terai than in mountain. In terai region the radius of earth is less as it lies close to the centre of the earth. Thus, the value of g is more in terai region.