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NAND GATE and NOR GATE can be used as universal gates because all the basic logic gates can be realized using NAND or NOR alone as detailed below.
Realization of Basic logic Gates using NAND
Realization of Basic logic Gates using NOR
Two frequencies sounded together produce 3 beats per second.If one of the frequencies is 400 vibrations per second,the other frequency will be?
Asked Tayyab Mynir
There are two possibilities because the beat frequency is equal to the difference in frequencies of the two sounding bodies.
So, the unknown frequency can be either 397 Hz or 403 Hz. This can be verified by lagging/ loading one of the sounding bodies.
Read more at http://en.wikipedia.org/wiki/Beat_(acoustics)