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एक अवमन्दित आवर्ती दोलक का विस्थापन निम्न है, x(t) = e-0.1t cos[10πt + Φ] यहाँ सेकण्ड में है। इसके दोलन आयाम को अपने आरम्भिक मान से आधा होने में लगे समय का सन्निकट मान होगा:

(a) 13 

(b) 7s

(c) 27s

(d) 4s

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