Two engineers are verifying whether a cavity drilled in the ground is in accordance with the planning of a construction project, whose required depth is 30 m. The test is performed by a device called a variable frequency audio oscillator, which allows relating the depth with the values of the frequency of two consecutive resonances, just as in a closed sound tube. The lowest resonance frequency that the device measured was 135 Hz. Consider that the speed of sound inside the drilled cavity is $360\mathrm{~m~s^{-1}}$. If the depth is in accordance with the project, what will be the value of the next resonance frequency that will be measured? (A) 137 Hz. (B) 138 Hz. (C) 141 Hz. (D) 144 Hz. (E) 159 Hz.
Two engineers are verifying whether a cavity drilled in the ground is in accordance with the planning of a construction project, whose required depth is 30 m. The test is performed by a device called a variable frequency audio oscillator, which allows relating the depth with the values of the frequency of two consecutive resonances, just as in a closed sound tube. The lowest resonance frequency that the device measured was 135 Hz. Consider that the speed of sound inside the drilled cavity is $360\mathrm{~m~s^{-1}}$.
If the depth is in accordance with the project, what will be the value of the next resonance frequency that will be measured?\\
(A) 137 Hz.\\
(B) 138 Hz.\\
(C) 141 Hz.\\
(D) 144 Hz.\\
(E) 159 Hz.