A body sends waves of different lengths through media P and Q: velocity in Q from velocity in P

1. A.
   $1\ \text{ms}^{-1}$
2. B.
   $2\ \text{ms}^{-1}$
3. C.
   $5\ \text{ms}^{-1}$
4. D.
   $7\ \text{ms}^{-1}$

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1. A.
   $4.0\ \mathrm{m\,s^{-1}}$
2. B.
   $3.2\ \mathrm{m\,s^{-1}}$
3. C.
   $2.0\ \mathrm{m\,s^{-1}}$
4. D.
   $1.6\ \mathrm{m\,s^{-1}}$

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