8.
【物理\(——\)选修\(3—5\)】
\((1).\)图甲为一列间歇横波在\(t\)\(=0\)时刻的波形图,\(P\)是平衡位置在\(x\)\(=1.0\)\(m\)处的质点,\(Q\)是平衡位置在\(x\)\(=4.0\)\(m\)处的质点,图乙为质点\(Q\)的振动图象,则下列说法正确的是( )
\(A.\)这列波的波长是\(8\)
\(m\),周期是\(0.2\)
\(s\),振幅是\(10\)
\(cm\) \(B.\)在
\(t\)\(=0\)时,质点\(Q\)向
\(y\)轴正方向运动
\(C.\)从
\(t\)\(=0.1\)到
\(t\)\(=0.25\)
\(s\),该波沿
\(x\)轴负方向传播了\(6\)
\(m\) \(D.\)从
\(t\)\(=0.1\)到
\(t\)\(=0.25\)
\(s\),质点\(P\)通过的路程为\(30\)
\(cm\) \(E.\)指点\(Q\)简谐运动的表达式为
\(y\)\(=0.10\)
\(\sin \)\(10π\)
\(t\)\((\)国际单位\()\)
\((2)\)如图所示,\(AOB\)为扇形玻璃砖,一细光束照射到\(AO\)面上的\(C\)点,入射光线与\(AO\)面的夹角为\(30^{\circ}\),折射光线平行于\(BO\)边,圆弧的半径为\(R\),\(C\)点到\(BO\)面的距离为,\(AD⊥BO\),\(∠DAO=30^{\circ}\),光在空气中国的传播速度为\(c\),求
\(①\)玻璃砖的折射率及光线在圆弧面上出射时的折射角;
\(②\)光在玻璃砖中传播的时间.