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【简答题】
如图所示,一平面简谐波沿x轴正方向传播,BC为波密媒质的反射面。波由P点反射, = 3λ/4, =λ /6。在t = 0时,O处质点的合振动是经过平衡位置向负方向运动。求D点处入射波与反射波的合振动方程。(设入射波和反射波的振幅皆为A,频率为ν。波长为λ 。)
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举一反三
【单选题】―Are you disappointed with the result of the experiment? ―No. ______, I’m pleased with it.
A.
On the contrary
B.
As a result
C.
What’s more
D.
On the one hand
【单选题】The following are all correct responses to "I'm very pleased to meet you." EXCEPT .
A.
Likewise
B.
Me too
C.
So am I
D.
I'm very pleased to meet you too
【单选题】I’m very pleased to know you.— ().
A.
Thanks
B.
The pleasure is mine
C.
Not at all
D.
welcome
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