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

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.
It is narrow band of high-velocity wind.

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Physics
In a conductor

The forbidden energy gap is very narrow
There is no conduction band
The valence band and the conduction band overlap each other
The forbidden energy gap is very wide

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