Adog sitting at the edge of the pool notices that 5 waves pass in fromt of his paws over a span of 1.72 seconds. he watches one wave in particular and notices that it goes from one end to other other 13 m in 13.54 seconds. what is the length of each wave?

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.