A NaI(Tl) detector is coupled to a photomultiplier tube having certain stages for electron multiplication. This detection system is used to detect g-rays of 1115 keV. The output circuit of photomultiplier has a capacitance of 250 pF. The average electron multiplication at each stage is 3. Assume light collection efficiency is unity, photocathode efficiency is 0.12 and 300 Ev energy is needed to create one photon and the amplitude of output pulse is 0.25 V. Find the number of multiplication stages in the photomultiplier?

Q: c) Consider an InGaAsP laser diode operating at 2=1310 nm for optical communications. The laser…

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A:

Q: Explain and fill in the table below with how VOUT differs between the two circuits in figures 2.1…

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Q: Calculate the conductivity of intrinsic silicon at 100°C.

A: According to the question, we need to calculate the conductivity of intrinsic silicon at 100°C.

Q: Determine the voltage across each diode in Figure below, using the complete diode model (3rd…

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Q: 3. Find no and Po, and locate the Fermi level. Draw the energy band diagram. a. b. Silicon is doped…

A: Refer explanationExplanation:

Q: 1. Using the chart above, find an appropriate resistor to each series circuit scenario below,…

A:

Q: A diode has wdo = 1.5 μm and φj = 0.8 V. (a) What is the depletion layer width for VR =5V? (b) For…

A: Given data: wdo=1.5 μmϕj=0.8 V a) The expression for the depletion layer width is given as,…

Q: b) A commercial laser diode with an emission wavelength of 670 nm (red) has the following…

A: Part b) Given: -A commercial laser diode with an emission wavelength of 670 nm.Find: -1) External QE…

Q: None

A: Step 1: Step 2: Step 3: Step 4:

Photoconductive Cell

Photoconductive cells are light-sensitive resistors in which resistance is inversely proportionated to light intensity when illuminated. These devices consist of a thin single-crystal or polycrystalline film of composite semiconductor materials. Cadmium sulfide (CdS) is used to make the most commercially available photoconductive particles which are sensitive to light in the visible spectrum. Other less commonly used substances respond to infrared light, but not to the visible spectrum. Such substances are lead sulfide (PbS), lead selenide (PbSe), and lead telluride (PbTe), and so on.