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Q. Why does sun seems flat during sunrise and sunset?
Answer:-
The sun rays have to move through a larger atmospheric distance. The majority of the blue light and shorter wave lengths are removed by scattering. Merely red colour which is least scattered is received by our eyes as well as appear to come from sun. Therefore the appearance of sun at sunset or sunrise looks almost flat.
Explain how suppressor grid eliminates effect of secondary emission in pentode Ans: Suppressor grid is placed in between plate and screen grid. It's connected with the cathode
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