Physics
A NOT gate can be implemented by:

A single resistor
Two diodes
A single diode
A single transistor

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

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.
It follows the wave path near the tropopause at elevations of 8 km to 15 km.

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