在同一媒質(zhì)中兩列相干的平面簡(jiǎn)諧波的強(qiáng)度之比是I1/I2=4,則兩列波的振幅之比A1/A2為:()
圖示一定量的理想氣體經(jīng)歷acb過(guò)程時(shí)吸熱500J。則經(jīng)歷acbda過(guò)程時(shí),吸熱量為:()
一平面簡(jiǎn)諧波沿X軸正向傳播,已知x=L(L<λ)處質(zhì)點(diǎn)的振動(dòng)方程為y=Acos(∞t+φ0),波速為u,那么x=0處質(zhì)點(diǎn)的振動(dòng)方程為:()