waec model questions vol1 2021 physics
Objective • Question 20
Question 20
WAEC_MODEL_QUESTIONS_VOL1
•
2021
A string of length 0.80 m is fixed at both ends. Its linear mass density is initially 0.010 kg m⁻¹ and the tension in the string is such that its fundamental frequency is 120 Hz. The tension is then increased by 20 % while the length remains unchanged. Under the new tension the frequency of the third harmonic is measured to be 540 Hz. Determine the new linear mass density of the string (in kg m⁻¹, expressed to three significant figures).
Answer Options
A.
6.12×10^-3
B.
4.27×10^-3
C.
5.33×10^-2
Correct Answer
D.
5.33×10^-3
Correct Answer
D
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