一简谐波的频率ν=2000Hz,波长λ=0.20m,则该波的周期和波速为(  )

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问题 一简谐波的频率ν=2000Hz,波长λ=0.20m,则该波的周期和波速为(  )。A.1/2000s,400m·s-1B.1/2000s,40m·s-1C.2000s,400m·s-1D.1/2000s,20m·s-1

选项 A.1/2000s,400m·s-1
B.1/2000s,40m·s-1
C.2000s,400m·s-1
D.1/2000s,20m·s-1

答案 A

解析 周期T=1/ν=1/(2000Hz)=1/2000s,则波速v=λ/T=0.20m/(1/2000s)=400m·s-1。
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