The Doppler Effect AP Physics 2 FRQ – Exam Style Questions etc.
The Doppler Effect AP Physics 2 FRQ
Unit 14: Waves , Sound , and Physical Optics
Weightage : 15–18%
Exam Style Practice Questions ,The Doppler Effect AP Physics 2 FRQ
Question
Sound of frequency f = 2500 Hz is emitted from an aircraft that moves with speed v = 280 ms–1 away from a stationary observer.
The speed of sound in still air is c = 340 ms–1.
frequency heard by the observer. [2]
wavelength measured by the observer. [1]
Answer/Explanation
Ans
i
f’ = 2500 × \(\frac{340}{340+280}\)
f ′ = 1371 ≈1400 «Hz »
ii λ = \(\frac{340}{1371}\) ≈ 0.24 / 0.25 «m »