પૃથ્વીની ફરતે ફરતા ઉપગ્રહની સાપેક્ષ અનિશ્ચિતતા \(10^{-2}\) છે.જો ભ્રમણ કક્ષાની ત્રિજ્યાની સાપેક્ષ અનિશ્ચિતતા નહિવત હોય તો પૃથ્વીના દળમાં સાપેક્ષ અનિશ્ચિતતા કેટલી હશે?

A \(3\times 10^{-2}\)
B \(10^{-2}\)
C \(2\times 10^{-2}\)
D \(6\times 10^{-2}\)

Verified Solution

Answer & Solution

Correct Answer

(C) \(2\times 10^{-2}\)

Step-by-step Solution

Detailed explanation

From Kepler's law, time period of a satellite, \(T = 2\pi \sqrt {\frac{{{r^3}}}{{Gm}}} \,\,\,\,\,\,\,{T^2} = \frac{{4{\pi ^2}}}{{GM}}{r^3}\) \(M = \frac{4\pi^2 r^3}{GT^2}\) \(\frac{\Delta M}{M} = 3 \frac{\Delta r}{r} + 2 \frac{\Delta T}{T}\)…

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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