# Wave propagation 2

The above diagram shows the displacement of mediums at a particular instant when a sound wave propagates from medium $$I$$ to medium $$II.$$ The speed of the sound wave in medium $$I$$ is $$400$$ m/s. Which of the following statements is correct?

Medium $$I$$ and $$II$$ are conspecific gases, and ignore the reflection of the sound wave at the boundary surface between the two mediums.

a) The frequency of the sound wave in medium $$I$$ is $$500$$ Hz.
b) The speed of the sound wave in medium $$I$$ is greater than that in medium $$II$$.
c) The temperature of medium $$I$$ is higher than that of medium $$II$$.

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