A cylindrical metal tube has a length of 50 cm and is open at both ends. Find the frequencies between 1 kHz to 2 kHz at which the air column in the tube resonates. The temperature on that day is 20∘c
A
1020, 11360, 1700 Hz
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B
1026, 1368, 1710 Hz
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C
1328, 1660, 1922 Hz
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D
none of these
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Solution
The correct option is B 1026, 1368, 1710 Hz v(T)=330√1+20273 =330√293273=342ms−1 f=vλ=3421=342Hz.
Checking from options for frequencies with a difference of 342 , gives option B