AOPE_2024_22_11_2024

The 2014 Nobel Prize in Physics for inventing blue light-emitting diodes (LEDs) was awarded to

• Pierre Agostini, Ferenc Krausz and Anne L’Huillier

• David Baker, Demis Hassabis and John Jumper

• Isamu Akasaki, Hiroshi Amano and Shuji Nakamura

• John J. Hopfield and Geoffrey E. Hinton

In which of the given applications do you find the usage of UV LEDs

• Long range illumination

• Microbial Disinfection

• Solar power generation

• General-purpose Lighting

The term "Fibre Optics" was coined by

• C.V. Raman

• Charles Kuen Kao

• Narinder Singh Kapani

• Naginder Singh

Identify the best context, the given image was showcased to you in any of the workshop sessions

• Laproscopy and Endroscopy

• Fibre-optic monitoring system

• Telecommunication

• Reflection

Which of the following is the correct order of electromagnetic waves, from longest to shortest wavelength?

• Radio waves, Microwaves, Infrared, Visible, Ultraviolet, X-rays, Gamma rays

• Gamma rays, X-rays, Ultraviolet, Visible, Infrared, Microwaves, Radio waves

• Microwaves, Radio waves, Infrared, Visible, Ultraviolet, X-rays, Gamma rays

• • Radio waves, Microwaves, Infrared, Visible, Ultraviolet, Gamma rays, X-rays

Which of the following is a characteristic of infrared radiation?

• It can be felt as heat

• • It can cause sunburn

• It is used in medical imaging techniques.

• It is used in communication technologies like WiFi

What are the material properties on which refractive index depends? Identify the best option.

• Permeability

• Permittivity

• Frequency

• Permittivity and Permeability

Essential condition for perfect absorption is

• Lattice Structure of materials

• Frequency

• Wavelength

• Impedance matching

What is the combination that is used for commercial solid state lighting?

• Blue LED + Yellow Phosphor

• Yellow LED + Blue Phosphor

• Green LED + Red Phosphor

• Red LED + Green Phosphor

What is the efficacy of an LED?

• 200 lm/W

• 100 lm/W

• 70 lm/W

• 300 lm/W