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Science Bowl Question

📅 NSB Round Robin 2013🎓 MS🔄 Round 2#️⃣ Question 3❓ TOSS-UP📝 Multiple Choice

A student hears the siren of a steadily approaching police car. Which of the following is true?

W) The sound waves decrease in speed as the car nears
X) The sound waves increase in speed as the car nears
Y) The perceived frequency of the siren is greater than the frequency heard when the police car is at rest
Z) The perceived frequency of the siren is less than the frequency heard when the police car is at rest
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