試卷名稱:106年 - 106 國立中山大學_碩士班招生考試_電機系(甲、己組)、電波領域:工程數學甲#125264
年份:106年
科目:中山◆電機◆工程數學甲
4. Consider the differential equation ẍ + bẋ + kx = cos(ωt) and its sinusoidal solution
. Which of the following is true?
(A) for a fixed b, the amplitude of
is maximized when k = ω²
(B) for a fixed b, the maximal amplitude of
is 1/b
(C) for fixed b and k, the amplitude of
always grows as ω increases
(D) the period of
is 2πω
(E) the period of
depends on b and k.