પૃથ્વીને ફરતે આપેલ કક્ષામાં પરિક્રમણ કરતા ઉપગ્રહની આવર્તકાળ \(7\) કલાક છે. જો કક્ષાની ત્રિજ્યા તેની અગાઉના મૂલ્ય કરતાં ત્રણ ગણી વધારવામાં આવે તો ઉપગ્રહનો નવો આવર્તકાળ કેટલો થશે ?

A \(40\)
B \(36\)
C \(30\)
D \(25\)

Verified Solution

Answer & Solution

Correct Answer

(B) \(36\)

Step-by-step Solution

Detailed explanation

\(T =\frac{2 \pi}{\sqrt{ GM }} r ^{3 / 2}\) \(\frac{ T _{1}}{ T _{2}}=\left(\frac{ r _{1}}{ r _{2}}\right)^{3 / 2}=\left(\frac{1}{3}\right)^{3 / 2}\) \(T _{2}= T _{1} 3 \sqrt{3}=21 \sqrt{3} \,\text { hours }\) \(\approx 36 \,\text { hours }\)

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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