પૃથ્વીની અત્યારની ત્રિજ્યા \((R =6400\, km)\) ને સંકોચીને કેટલી કરવાથી પૃથ્વીની નિષ્ક્રમણ ઝડપ \(10\) ગણી થાય?

A \(64\)
B \(36\)
C \(72\)
D \(81\)

Verified Solution

Answer & Solution

Correct Answer

(A) \(64\)

Step-by-step Solution

Detailed explanation

\(V _{ e }=\sqrt{\frac{2 Gm }{ R }}\) \(10 V _{ e }=\sqrt{\frac{2 Gm }{ R ^{\prime}}}\) \(\therefore 10=\sqrt{\frac{ R }{ R ^{\prime}}}\) \(\Rightarrow R ^{\prime}=\frac{ R }{100}=\frac{6400}{100}=64 km\)

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.

Same subject

List-I ને List-II સાથે જોડો.

સૂચિ - I	સૂચિ - II
(A) ત્રિ-પરિમાણીય જડ વાયુ	(I) \(\frac{C_P}{C_V} = \frac{5}{3}\)
(B) દ્વિ-પરિમાણીય અજડ વાયુ	(II) \(\frac{C_P}{C_V} = \frac{7}{5}\)
(C) એક-પરિમાણીય વાયુ	(III) \(\frac{C_P}{C_V} = \frac{4}{3}\)
(D) દ્વિ-પરિમાણીય જડ વાયુ	(IV) \(\frac{C_P}{C_V} = \frac{9}{7}\)

નીચે આપેલા વિકલ્પોમાંથી યોગ્ય ઉત્તર પસંદ કરો :

JEE Mains 2025 Medium

Explore more questions on app

From JEE Mains

Explore more questions on app