  We propose a home laboratory in which a telescopic vacuum cleaner pipe and a
smartphone are used to investigate sound speed and acoustic resonance. When the
pipe is hit or the hands clapped near one end the sound produced is registered
by a smartphone. By means of an appropriate application the resonant frequency
is obtained. Varying the pipe's length and registering the corresponding
resonant frequency allows to obtain the sound speed. This home-lab, first
proposed during covid19 pandemic, has been incorporated as a home challenge to
experiment with acoustic resonance in new normal times.
