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Low-Q means the transducer’s energy is not tightly confined to a single frequency; its energy is more readily dissipated, so the frequency response is broad. That broad response shows up as a wide bandwidth. A wide bandwidth allows the emitted and received signal to contain many frequencies, which translates to a short pulse in time and therefore better axial resolution. It also makes multifrequency imaging possible because you can use or extract information across a broad range of frequencies to optimize penetration and detail at different depths. The other statements describe high-Q behavior: narrow bandwidth and long pulse length come from high-Q, and a broad range of frequencies enables multifrequency imaging, not the opposite. So, a low-Q transducer is best described as having a wide bandwidth.