निम्नलिखित में से कौन सा उपकरण विशेष रूप से ऑप्टिकल विकिरण (optical radiation) को सीधे विद्युत ऊर्जा में बदलने के लिए डिज़ाइन किया गया है?

What is the fundamental physical process by which a Light Emitting Diode (LED) generates light, making it more energy-efficient than traditional filament-based bulbs?

If the backlight intensity setting in an LCD/LED TV is increased, what is the immediate effect on the screen?

In an LCD panel, liquid crystal molecules respond to applied voltage to control light passing through them. What is this process mainly responsible for?

Light Emitting Diodes (LEDs) are primarily manufactured using which type of materials?

Avalanche photodiodes (APDs) are preferred in optical communication systems because they provide:

Arrange the following semiconductor materials in ascending order of their emission wavelength: A. GaAs having Eg = 1.4 eV B. Al0.2Ga0.8As having Eg = 1.62 eV C. Al0.4Ga0.6As having Eg = 1.92 eV D. GaAs0.4P0.6 having Eg = 2.2 eV E. GaAs0.2P0.8 having Eg = 2.5 eV Choose the correct answer from the options given below:

Given below are two statements: Assertion A: In a photodetector, it is desired that the width of the depletion region W be large enough so that most of the incident photons are absorbed within W rather than in the neutral n and p regions. Reason R: A wider depletion width W results in a smaller junction capacitance, which generally improves the bandwidth/speed. In the light of the above statements, choose the most appropriate answer:

A photodiode is typically operated under which bias condition for efficient and fast light detection?