waec model questions vol1 2019 physics
Objective • Question 2
Question 2
WAEC_MODEL_QUESTIONS_VOL1
•
2019
A string of length 0.50 m and linear mass density 0.010 kg m⁻¹ is fixed at both ends. When the string is under an unknown tension T it vibrates in its second harmonic with a frequency of 200 Hz. The tension is then increased by 25 % and the string vibrates in its fundamental with a frequency of 112 Hz (to the nearest whole number). Determine the original tension T in newtons.
Answer Options
A.
125 N
B.
80 N
Correct Answer
C.
100 N
D.
150 N
Correct Answer
C
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