A tuba creates a 4th harmonic of frequency 116.5 Hz. What is the
frequency of the third harmonic?
(Speed of sound = 343 m/s)
(Unit = Hz)

The first-order reaction a→2b+c has rate constant 0.538 s−1. if the initial concentration of a is 0.867 mol l−1, what is the half-life of the reaction in seconds? remember to use correct significant figures in your answer (round your answer to the nearest hundredth). do not include units in your response.