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Question 19M.2.HL.TZ2.3ei

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Date May 2019 Marks available [Maximum mark: 2] Reference code 19M.2.HL.TZ2.3ei
Level HL Paper 2 Time zone TZ2
Command term Calculate Question number ei Adapted from N/A
ei.
[Maximum mark: 2]
19M.2.HL.TZ2.3ei

Sound of frequency f = 2500 Hz is emitted from an aircraft that moves with speed v = 280 m s–1 away from a stationary observer. The speed of sound in still air is c = 340 m s–1.

(ei)

Calculate the frequency heard by the observer.

[2]

Markscheme

f ′ = 2500 × 340 340 + 280   ✔

f ′ = 1371 ≈ 1400 «Hz»   ✔

Examiners report

This was answered well with the most common mistake being to swap the speed of sound and the speed of the aircraft.

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