Physics
Which one of the following statements with regard to Jet stream, an upper level tropospheric wave, is not correct?

It is narrow band of high-velocity wind.
It follows the wave path near the tropopause at elevations of 8 km to 15 km.
In summer, the polar front jet achieves its maximum force.
Jet streams are typically continuous over long distances.

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Physics
A transformer

Converts electrical energy into mechanical energy
Converts DC to AC
Is used to decrease or increase AC voltage
Converts AC voltage to D.C. voltage

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