Neco 2024 Physics Question 12

Practice objective / multiple choice question 12 from the 2024 Neco Physics examination.

Neco 2024 Physics Objective / Multiple Choice Medium Difficulty
Question 12 NECO • 2024 • PHYSICS • objective

The speed of sound in air varies with temperature according to \(v = 331 + 0.6T\) where \(v\) is in \(\text{m s}^{-1}\) and \(T\) in \(^\circ\text{C}\). A source emits a tone of frequency \(f_s = 800\ \text{Hz}\) while moving away from a stationary observer at \(5\ \text{m s}^{-1}\). At the same time the observer moves toward the source at \(10\ \text{m s}^{-1}\). If the air temperature is \(25\ ^\circ\text{C}\), determine the frequency heard by the observer and the wavelength of the sound in the air. Give the frequency to the nearest hertz and the wavelength to three significant figures.

Answer Options

Correct Answer A. Observed frequency \(\approx 811\ \text{Hz}\); wavelength \(\approx 0.433\ \text{m}\).
B. Observed frequency \(\approx 800\ \text{Hz}\); wavelength \(\approx 0.433\ \text{m}\).
C. Observed frequency \(\approx 811\ \text{Hz}\); wavelength \(\approx 0.427\ \text{m}\).
D. Observed frequency \(\approx 789\ \text{Hz}\); wavelength \(\approx 0.439\ \text{m}\).
Correct Answer
A
Correct Option:
Observed frequency \(\approx 811\ \text{Hz}\); wavelength \(\approx 0.433\ \text{m}\).

About This Question

This is Neco 2024 Physics Question 12. It is one of the objective questions from the 2024 Neco Physics examination.

Difficulty level: Medium .

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