Solved UPSC CDS/OTA Question
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Q · Waves and SoundModerate · 45s
A tuning fork of frequency 512 Hz resonates with a closed pipe. What is the length of the pipe if the speed of sound is 320 m/s? 189
TopicWaves and Sound
Question Typemultiple choice
DifficultyModerate
Marking+1 / −0.33
Test Duration30 min
Step-by-Step Solution
The complete worked solution.
Every step explained — no skipped algebra.
Closed pipe: L = λ/4 → λ = v/f = 320/512 ≈ 0.625 m → L = 0.625/4 ≈ 0.156 m ≈ 16 cm.
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Final Answer: Option B — 16 cm
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