For effective reflection of sound, the tubes used in the experiment should have: a) equal lengths around 25to30cm b) - Science - Sound

Question

For effective reflection of sound, the tubes used in the experiment
should have:

a) equal lengths around 25to30cm
b) any lenght and may be unequal
c) equal lenghts but short
d) no conditions on the lenghth of the tube

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For effective reflection of sound, the tubes used in the experiment should have: a) equal lengths around 25to30cmb) any lenght and may be unequalc) equal lenghts but shortd) no conditions on the lenghth of the tube