The figure below shows the small signal equivalent circuit of a transistor amplifier. The transistor has the following small signal parameters hte = 90, he = 3 kN, hoe = 0 S 35 kn 15 kn hie 4.7 ko Vo If the input signal of the amplifier v. has a 20 mV amplitude, calculate the amplitude of the output signal vVo. You may assume C is large i) ii) Calculate the input impedance of the amplifier again assuming C is large. iii) The output of the above amplifier is loaded by a second circuit that has an input resistance of 10 ko. Calculate the new value of vo. iv) Determine the value of the input coupling capacitor C that will give a lower cut-off frequency of 60 Hz.

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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).