Waec Model Questions Vol1 2021 Physics Question 7

Practice objective / multiple choice question 7 from the 2021 Waec Model Questions Vol1 Physics examination.

Waec Model Questions Vol1 2021 Physics Objective / Multiple Choice Medium Difficulty
Question 7 WAEC_MODEL_QUESTIONS_VOL1 • 2021 • PHYSICS • objective

A string 1.20 m long is fixed at both ends and vibrates in its third harmonic with a frequency of 180 Hz. The linear mass density of the string is 0.025 kg m⁻¹. (a) Calculate the speed of the transverse wave on the string and the tension in the string. (b) If the tension is increased by 20 % while the string length remains unchanged, what is the new frequency of the third harmonic.

Answer Options

Correct Answer A. Wave speed = 144 m/s; tension = 5.18×10² N; new frequency ≈ 197 Hz
B. Wave speed = 130 m\/s; tension = 4.70×10² N; new frequency ≈ 185 Hz
C. Wave speed = 120 m\/s; tension = 3.90×10² N; new frequency ≈ 170 Hz
D. Wave speed = 158 m\/s; tension = 5.80×10² N; new frequency ≈ 210 Hz
Correct Answer
A
Correct Option:
Wave speed = 144 m/s; tension = 5.18×10² N; new frequency ≈ 197 Hz

About This Question

This is Waec Model Questions Vol1 2021 Physics Question 7. It is one of the objective questions from the 2021 Waec Model Questions Vol1 Physics examination.

Difficulty level: Medium .

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