Answer:
option c) 0.88c is the correct answer
Explanation:
using the Lorrentz equation we have

where,
t = time taken to cover the distance
d = Distance
v = velocity
c = speed of light
given
d = 15 light years
Now,

or

or

or

or

or

or

Answer:
0.3 %
Explanation:
Earth cleans and replenishes the water supply through the hydrologic cycle. The earth has an abundance of water, but unfortunately, only a small percentage, is even usable by people.
Option A: The air molecule moves from the girl's mouth to the ear of her friend