Neco Model Questions Vol1 2017 Physics Question 29

Practice objective / multiple choice question 29 from the 2017 Neco Model Questions Vol1 Physics examination.

Neco Model Questions Vol1 2017 Physics Objective / Multiple Choice Medium Difficulty
Question 29 NECO_MODEL_QUESTIONS_VOL1 • 2017 • PHYSICS • objective

A string of length \(L\) is fixed at both ends and has a linear mass density \(\mu\). When a tension \(T\) is applied, its fundamental frequency is \(120\ \text{Hz}\). The tension is then increased by \(20\%\) while \(\mu\) remains unchanged. (a) What is the new fundamental frequency? (b) By what percentage does the wavelength of the fundamental mode change?

Answer Options

A. (a) \(\approx124\ \text{Hz}\); (b) \(5\%\) decrease
B. (a) \(\approx138\ \text{Hz}\); (b) \(0\%\) (no change)
Correct Answer C. (a) \(\approx131\ \text{Hz}\); (b) \(0\%\) (no change)
D. (a) \(\approx131\ \text{Hz}\); (b) \(10\%\) increase
Correct Answer
C
Correct Option:
(a) \(\approx131\ \text{Hz}\); (b) \(0\%\) (no change)

About This Question

This is Neco Model Questions Vol1 2017 Physics Question 29. It is one of the objective questions from the 2017 Neco Model Questions Vol1 Physics examination.

Difficulty level: Medium .

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