Igcse Model Questions Vol1 2020 Physics Question 20

Practice objective / multiple choice question 20 from the 2020 Igcse Model Questions Vol1 Physics examination.

Igcse Model Questions Vol1 2020 Physics Objective / Multiple Choice Hard Difficulty
Question 20 IGCSE_MODEL_QUESTIONS_VOL1 • 2020 • PHYSICS • objective

A source emits sound of frequency 500 Hz. The source moves towards a stationary observer at 20 m s⁻¹ while the observer moves away from the source at 10 m s⁻¹. The speed of sound in air is 340 m s⁻¹. (a) Calculate the frequency heard by the observer. (b) If the observed frequency is measured as 540 Hz under the same motions, determine the actual speed of sound in the air.

Answer Options

A. a) ≈ 500 Hz, b) v ≈ 300 m s⁻¹
B. a) ≈ 540 Hz, b) v ≈ 200 m s⁻¹
Correct Answer C. a) ≈ 516 Hz, b) v ≈ 145 m s⁻¹
D. a) ≈ 530 Hz, b) v ≈ 350 m s⁻¹
Correct Answer
C
Correct Option:
a) ≈ 516 Hz, b) v ≈ 145 m s⁻¹

About This Question

This is Igcse Model Questions Vol1 2020 Physics Question 20. It is one of the objective questions from the 2020 Igcse Model Questions Vol1 Physics examination.

Difficulty level: Hard .

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