A sound wave of frequency 440 hz travels at a speed of 344m/s through the air in a concert hall. how fast would a note one octave higher, 880hz travel through the same concert hall?

The speed of a sound wave does not depend on the frequency of the wave, but only on the properties of the medium.

Since we are in the same concert all, the medium of propagation is still the same (the air), so it has not changed; therefore, the speed of the sound wave has not changed, and it is still 344 m/s.

So, the correct answer is "344 m/s".