What is the period of a wave with frequency $25 Hz$ ?

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A wave has frequency $50 Hz$ and wavelength $6 m$ . What is its speed?
Light travels at $2 \times 1 0^{8} m/s$ in a glass. What is the refractive index of the glass ( $c = 3 \times 1 0^{8} m/s$ )?
How much heat raises the temperature of $2 kg$ of water by $10 K$ ( $c = 4200 J/(kg K)$ )?
A gas in a rigid container is heated from $300 K$ to $600 K$ . If its pressure was $1 atm$ , what is it now?
An object stands $30 cm$ in front of a converging lens with focal length $10 cm$ . Where is the image?
A Carnot engine works between reservoirs at $400 K$ and $300 K$ . What is its maximum efficiency?