Question

It is equally well known that a GPS satellite needs an extremely accurate clock to function correctly; it is less well known however, that GPS satellites also need to adjust for the effects of time dilation, because time passes more slowly on the satellite than it does on earth.

• A. It is equally well known that a GPS satellite needs an extremely accurate clock to function correctly; it is less well known however, that GPS satellites also need to adjust for the effects of time dilation, because time passes more slowly on the satellite than it does on earth.
• B. An extremely accurate clock is as essential to the functioning of a GPS satellite as is the need to take a phenomenon, called time dilation, according to which time passes relatively slowly on the satellite than on the earth, into account.
• C. An extremely accurate clock is as important to the correct functioning of GPS satellite as to taking into account a phenomenon called time dilation because time passes slower on the satellite than that on the earth.
• D. Because time passes slowly on the satellite than on earth, due to time dilation, an extremely accurate clock is needed for the proper functioning of a GPS satellite so as to account for the same.
• E. From the perspective of an observer on the earth, time passes more slowly on the satellite than on the earth; this phenomenon, called time dilation, must be taken into account for even a GPS satellite equipped with an extremely accurate on-board clock to function correctly.

Answer 1

The correct option is E From the perspective of an observer on the earth, time passes more slowly on the satellite than on the earth; this phenomenon, called time dilation, must be taken into account for even a GPS satellite equipped with an extremely accurate on-board clock to function correctly.

(E) (Correct Choice) From the perspective of an observer on the earth, time passes more slowly on the satellite than on the earth; this phenomenon, called time dilation, must be taken into account for even a GPS satellite equipped with an extremely accurate on-board clock to function correctly. Semicolon in (E) makes perfect sense $\Rightarrow$ It is connecting two independent clauses. These are two closely related statements, each able to stand alone as an independent sentence.