# Did You Know?

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Latest amazing phenomenon of physics are added here every moment to keep you updated always.

• ## Quiz Based on Scalar and Vector

In physics, mathematical quantities that can be used to describe the motion of objects can be divided into two categories: scalars and vectors. Scalars are quantities that are described by magnitude and vectors are quantities that are described by magnitude and direction. Examples of scalars: speed, distance Examples of vectors: displacement, velocity, acceleration 10 ft is a scalar, but 10 ft NW is a vector. For each question in the following quiz, choose whether the given quantity is a vector or a scalar. Remember that scalars have magnitude, but vectors have both a magnitude and direction. Please select the best answer from the given choices.
• ## Quiz Based on Momentum

Momentum is "inertia of motion." A rolling marble can be stopped easier than a bowling ball moving at the same velocity because the bowling ball has more momentum. Momentum of a moving object is related to mass and velocity. If the mass changes or the velocity changes, or both, then the momentum changes. Momentum can also be transferred to other objects. This quiz covers momentum questions. Select the best answer from the choices.
• ## Quiz BAsed on Force Acceleration and Mass

This quiz will illustrate the relationship between acceleration, force, and mass. Examples of the relationship between the three will be explored with various examples.
• ## Physics 10 Quiz Based On NLM

Physics Newtons Laws Of Motion Quiz Contest
• ## Physicists read Maxwell's Demon's mind

An international research team, including Dr Janet Anders from the University of Exeter, have used superconducting circuits to bring the 'demon' to life. The demon, first proposed by James Clerk Maxwell in 1867, is a hypothetical being that can gain more useful energy from a thermodynamic system than one of the most fundamental laws of physics -- the second law of thermodynamics -- should allow. Crucially, the team not only directly observed the gained energy for the first time, they also tracked how information gets stored in the demon's memory. The research is published in the leading scientific journal Proceedings of the National Academy of Sciences (PNAS). The original thought experiment was first proposed by mathematical physicist James Clerk Maxwell -- one of the most influential scientists in history -- 150 years ago. He hypothesised that gas particles in two adjacent boxes could be filtered by a 'demon' operating a tiny door, that allowed only fast energy particles to pass in one direction and low energy particles the opposite way. As a result, one box gains a higher average energy than the other, which creates a pressure difference. This non-equilibrium situation can be used to gain energy, not unlike the energy obtained when water stored behind a dam is released. So although the gas was initially in equilibrium, the demon can create a non-equilibrium situation and extract energy, bypassing the second law of thermodynamics. Dr Anders, a leading theoretical physicist from the University of Exeter's physics department adds: "In the 1980s it was discovered that this is not the full story. The information about the particles' properties remains stored in the memory of the demon. This information leads to an energetic cost which then reduces the demon's energy gain to null, resolving the paradox." In this research, the team created a quantum Maxwell demon, manifested as a microwave cavity, that draws energy from a superconducting qubit. The team was able to fully map out the memory of the demon after its intervention, unveiling the stored information about the qubit state. Dr Anders adds: "The fact that the system behaves quantum mechanically means that the particle can have a high and low energy at the same time, not only either of these choices as considered by Maxwell." This ground-breaking experiment gives a fascinating peek into the interplay between quantum information and thermodynamics, and is an important step in the current development of a theory for nanoscale thermodynamic processes.
• ## Periodic Table Quiz

here are many periodic tables with structures different than that of the standard form we use today. Within 100 years of the creation of Mendeleev’s table in 1869 it has been calculated that atleast 700 other periodic table versions were introduced.