A vibrating stretched string has nodes or fixed points at each end. The string will vibrate in its fundamental frequency with just one anti node in the middle - this gives half a wave.
![l=\frac{\lambda }{2}](https://tex.z-dn.net/?f=l%3D%5Cfrac%7B%5Clambda%20%7D%7B2%7D)
Rearranging for the wavelength
![\lambda=2l](https://tex.z-dn.net/?f=%5Clambda%3D2l)
![\lambda =2(7)](https://tex.z-dn.net/?f=%5Clambda%20%3D2%287%29)
![\lambda = 14m](https://tex.z-dn.net/?f=%5Clambda%20%3D%2014m)
Therefore the longest wavelength standing wave that it can support is 14m
I’d say 10200m as the answer not sure though
Most clouds form in the atmosphere when moist air rises expands and cool to the dew point. When the air above reaches its saturation point, the water vapor is attracted to dust particles which when they accumulate the hold on tho each other and form clouds. Evaporation and condensation is what causes saturation above. When the clouds become heavy enough with moisture, the water then fall to earth as rain. <span />
C. Hot air balloons use convection to rise.