1) Here we illustrate one of the most important consequences of the properties of linearity and time invariance. Specifically, once we know the response of a linear system or a linear time-invariant (LTI) system to a single input or responses to several inputs, we can directly compute the responses to many other input signals. a) Consider an LTI system whose response to the signal x1(t) shown below is the signal y1(t). Determine and sketch carefully the response of the system to the input x2(t). b) Determine and sketch the response of the system in part (a) to the input x3(t). X1 (t) y (t) 2- 1 1 2 (a) (b) X2 (t) X3 (t) 1 2 3 -1 0 1 (c) (d)

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Q: Breif the difference in the active and passive element.

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A: The above question is based on BJT circuit analysis.

Photoelectric

The photoelectric effect occurs when light (or similar incident radiation, including X-rays) falls on material together with a metal plate and causes it to emit electrons. The discovery of the photoelectric effect led to important new theories (and to a Nobel Prize for Albert Einstein). Photoelectric cells, or photocells, are utilized in burglar-alarm light detectors and garage-door openers (each employs a through-beam of light this is broken when something movements throughout it), and also to play soundtracks on film movies (in which a light beam shines through the soundtrack encoded at the film and is "read" with the aid of the photocells).