The experiment of Michelson and Morley

Light was assumed to propagate in a medium called ether which was all pervading and stationary. Earth’s motion through ether was expected to have an effect on the velocity of light in the direction of the relative motion by the law of addition of velocities. Michelson–Morley experiment used an interferometric technique to detect this effect and got a null result, which was the first strong evidence against existence of ether and eventually had a natural explanation in special theory of relativity.     

Story of superconductivity

Electricity is carried through metallic wires, called conductors. In the process, electrons move through metallic conductors that offer resistance (the value depends on the particular metal used), to the passage of electrons. This leads to the production of heat and loss of energy. This heating process is utilised in many electrical devices. However, for transmission of electrical energy from the power plants to the user and in many other applications, it would be a great boon if no energy was lost to resistance. The discovery of superconductivity by Heike Kamerlingh Onnes in 1911 at Leiden, offered a glimmer of hope to make this dream possible. It was a discovery totally unexpected at that time, and we owe this discovery to the painstaking and methodical investigations of Onnes–first to produce very low temperatures, and then measure properties of materials at these freezing temperatures.     

Hollywood studio filmmaking in the age of Netflix: a tale of two institutional logics

Journal of Cultural Economics - Online streaming services are challenging long-standing decision-making processes in the traditional motion picture industry, thus placing Hollywood major studios at...     

Great experiments in physics

In Part 1 of this article, we described masers. In this part, we describe lasers, their optical counterpart.     

Demonstration model of self inductance using relay

Using an electrical component like a relay, the phenomenon of self inductance caneasily be demonstrated to undergraduate students. By wiring simple electrical components like relay, neon bulb and a DC power supply, intermittent back electromotive force (emf) can be generated in the range from 60 to 100 volt. The glowing of neon bulb provides visual evidence for the generation of large back emf due to self inductance.     

Impact of AR-based collaborative learning approach on knowledge gain of engineering students in embedded system course

Education and Information Technologies - Collaborative learning is the favored approach educators use to inculcate social skills and promote peer interactions in students. Embedded Systems is a...     

Optimal educational climate among students at risk: the role of teachers’ work attitudes

European Journal of Psychology of Education - One of the most significant phenomena among students at risk is low resilience. However, very little is known about teacher-related factors that affect...