Estimate the frequency of the sound of the ocean when you put your ear very near

Question

Estimate the frequency of the sound of the ocean when you put your ear very near a 13cm diameter sea shell. The speed of sound in air is 343m/s.
Note- I got 1.3, 2.6, 1319,1.3x10^2 and 1.3 x 10^3 and they were all wrong so your answer shouldn't be any of these. Estimate the frequency of the sound of the ocean when you put your ear very near a 13cm diameter sea shell. The speed of sound in air is 343m/s.
Note- I got 1.3, 2.6, 1319,1.3x10^2 and 1.3 x 10^3 and they were all wrong so your answer shouldn't be any of these.
Note- I got 1.3, 2.6, 1319,1.3x10^2 and 1.3 x 10^3 and they were all wrong so your answer shouldn't be any of these.

Explanation / Answer

assuming the seashell is open at both ends,

for funamental frequency

lambda/2 = 13 cm

lambda = 26 cm

hence the required frequency is

f = v / lamda

= 343 / 0.26 m = 1319.23 Hz

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