Which of the following compounds is not suitable for Light Emitting Diodes (LEDs) ?
SiCa
An LED needs a semiconductor compound with a suitable band gap (preferably direct) so that electron-hole recombination releases photons.
GaN is a direct band gap III-V compound used for blue, violet and white LEDs.
GaP is a III-V compound used for red, yellow and green indicator LEDs, and GaAs (direct gap about 1.42 eV) is used for infrared LEDs.
SiCa is not a recognised semiconductor compound at all (the LED material of silicon is silicon carbide, SiC), so it cannot serve as an LED material.
Hence, SiCa.
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Important Questions from Mixed Topic (MH-SET)
.................... is a client server application that identifies each host on the internet with a unique user-friendly name.
Every OS has a ................ or .......... which primarily resides in the main memory of the computer to perform some of the basic functions of the OS.
(i) Kernel
(ii) Interface
(iii) Nucleus
(iv) Compiler
Codes:
Which of the following are referred to as low level language?
(i) Machine language
(ii) Assembly language
(iii) High level language
(iv) Natural language
Codes:
Match the following:
List I List II (a) New York Public Library (i) Shelv AR (b) Miami University Augmented Research Group (ii) Smart library (c) Oula University Library (iii) Wolf Walk (d) North Carolina State University (iv) Find the future Codes:
Which part of the QR code represents the encoded data?
