A resonance air column of length 20 cm resonates with a tuning fork of – McqOptions

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1.	A resonance air column of length 20 cm resonates with a tuning fork of frequency 250 Hz. The speed of sound in air is [AFMC 1999; BHU 2000; CPMT 2001]
A.	300 m/s
B.	200 m/s
C.	150 m/s
D.	75 m/s
Answer» C. 150 m/s

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