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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