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Wave Equation. 
Here are a couple of questions that use the wave equation for you to try. 
Question 1. 
A sound wave travels through a liquid with a wavelength of 1.5m and a frequency of 300Hz. 
What speed is the wave travelling at? 
Question 2. 
A sound wave travels through a liquid with a wavelength of 2.1m and a frequency of 300Hz. 
What speed is the wave travelling at?

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