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  • How to measure the activity of a radioactive source
    The collected charge could have been originated by a few high energetic particle (thus low activity) or by lots of lower energetic particles (thus high activity) On the other end if you work in pulse mode you would have measured a number of pulses equal to the number of decay events, thus the calculation of the activity is easily carried out
  • What is the Relationship Between Vacuum Energy and Fluctuations?
    Participants explore theoretical concepts, definitions, and implications of vacuum states in quantum mechanics and quantum electrodynamics Some participants define an ordinary vacuum as a space devoid of particles, while quantum vacuum is described as the lowest energetic state of a quantum system, lacking quantum excitations
  • Falling into a Black Hole: Blueshift Questions Explored
    The discussion revolves around the effects of blueshift and redshift experienced by observers near and inside a black hole, particularly as they approach the event horizon Participants explore the implications of general relativity on light perception, the influence of black hole size on tidal forces, and the relationship between observer motion and spectral shifts Some participants suggest
  • The Many Faces of Topology - Physics Forums
    Topology is a branch of mathematics that encompasses many different parts It is sometimes even difficult to see what these branches have in common or why they are all called topology
  • Conservation of kinetic energy in expanding space - Physics Forums
    Let's assume that a universe (not ours, but subject to the same laws of physics) consists of a single hydrogen atom in an initially energetic state surrounded by expanding space The atom's electron gradually emits photons over time as it loses energy to the expanding space around it until it eventually reaches the ground state
  • Do Light Waves Have Amplitude? - Physics Forums
    I don't think you can define "amplitude" for a single photon In the classical picture, light is an electromagnetic wave and the amplitude of the electric magnetic fields is the property you talk about In the quantum picture, light is made up of photons and the number of photons describe the amplitude That's my understanding
  • A Definition and Controversy of Energy - Physics Forums
    This perfectly legitimate question seems to cause a lot of confusion So what is energy and how do conversations about what it is go wrong?
  • Exploring the Anatomy of Compton Scattering - Physics Forums
    From the above equations, Compton solved for two variables namely the ratio of electron speed to the velocity of light, and for , the frequency of the scattered photon He re-wrote the solution for the second in wavelength form as it is commonly presented (albeit requiring us to replace with where is the scattering angle):
  • Can mass be created or destroyed? - Physics Forums
    mmwave: You mean yes, matter can be created or destroyed, right? Other examples: matter-antimatter annihilation, pair production by energetic photon Correction: mass in the conventional sense can be destroyed, but mass energy is conserved
  • Is it true that gravitation on the full moon day is less than other . . .
    The discussion revolves around the effects of the full moon on gravitational forces experienced on Earth, particularly whether gravitation is less on full moon days compared to other days Participants explore concepts related to gravitational attraction, tidal influences, and anecdotal observations regarding human behavior during different moon phases Some participants suggest that the moon





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