Gce Model Questions Vol1 2020 Physics Question 38

Practice objective / multiple choice question 38 from the 2020 Gce Model Questions Vol1 Physics examination.

Gce Model Questions Vol1 2020 Physics Objective / Multiple Choice Medium Difficulty
Question 38 GCE_MODEL_QUESTIONS_VOL1 • 2020 • PHYSICS • objective

A closed (one end closed, one end open) pipe resonates at its third harmonic with a frequency of \(440\,\text{Hz}\) when the temperature is \(20^{\circ}\text{C}\). Assuming the speed of sound varies with temperature as \(v = 331 + 0.6T\) (with \(T\) in °C), find the length of the pipe and the frequency it would produce at \(30^{\circ}\text{C}\) when vibrating in the same harmonic.

Answer Options

A. Length \\(L \\approx 0.95\\,\\text{m}\\); frequency at 30°C \\(\\approx 460\\,\\text{Hz}\\)
B. Length \\(L \\approx 0.88\\,\\text{m}\\); frequency at 30°C \\(\\approx 452\\,\\text{Hz}\\)
C. Length \\(L \\approx 1.02\\,\\text{m}\\); frequency at 30°C \\(\\approx 440\\,\\text{Hz}\\)
Correct Answer D. Length \(L \approx 0.974\,\text{m}\); frequency at 30°C \(\approx 448\,\text{Hz}\)
Correct Answer
D
Correct Option:
Length \(L \approx 0.974\,\text{m}\); frequency at 30°C \(\approx 448\,\text{Hz}\)

About This Question

This is Gce Model Questions Vol1 2020 Physics Question 38. It is one of the objective questions from the 2020 Gce Model Questions Vol1 Physics examination.

Difficulty level: Medium .

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