Math Problem Statement
某物理兴趣小组根据高速公路雷达测速仪的原理制作了超声波测速仪,该测速仪每隔0.4s发射一束短促超声波,超声波遇阻碍物反射后,其反射回波被测速仪接收,并能与发射波显示在同一显示屏上.为保证正常测速,回波需在下次发射波发射前被接收.已知空气中超声波速度为 340m/s.(2)当车远离测速仪运动时,该测速仪理论上所能测得的最大速度v;
(3)当车以100ms的速度向测速仪靠拢时,车应处于一段可测速区,才能被测速(如图 2),求 d 、d..
Solution
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Math Problem Analysis
Mathematical Concepts
Physics
Wave Propagation
Doppler Effect
Kinematics
Formulas
t = 2d / v_{sound}
f_{echo} = f_0 ( v_{sound} / (v_{sound} + v_{car}) )
t_{echo} = d / (v_{sound} - v_{car})
Theorems
Doppler Effect Theorem
Wave Propagation Time Formula
Suitable Grade Level
Grades 10-12
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