What Does Negative Current Density Mean? A negative current density would indicate (conventional) current flow into a surface. Can there be negative density? There can not be less than zero charge, therefore charge density can not be negative. Consequently, there can be a density of negative charge but can not be negative charge density. Can
Can Mass Be Zero? In particle physics, a massless particle is an elementary particle whose invariant mass is zero. The two known massless particles are both gauge bosons: the photon (carrier of electromagnetism) and the gluon (carrier of the strong force). … Neutrinos were originally thought to be massless. Can an object have a mass
Do Sound Waves Have Mass? Sound waves do carry mass. … The calculations show that sound waves carry a tiny negative mass, which means that in the presence of a gravitational field, such as that of the Earth, their trajectory is bent upwards. Esposito and colleagues found that sound waves also generate a small gravitational
Is Effective Mass Negative Or Positive? As one can see from the dispersion curves, the effective mass of the electrons in the valence band, m*V, is always negative. (This means that a force in +x direction will cause such an electron to move in –x direction.) Can effective mass be positive? the bubble always moves
Can You Have A Negative Mechanical Energy? Can you have a negative mechanical energy? Yes mechanical energy can be negative. Mechanical energy is the sum of potential as well as kinetic energy. When can total mechanical energy be negative? The gravitational potential energy between the two objects that binds them together is always negative. It
Does Magnitude Have To Be Positive? Does magnitude have to be positive? Can it be zero? Answer: Magnitude cannot be negative. It is the length of the vector which does not have a direction (positive or negative). In the formula, the values inside the summation are squared, which makes them positive. What does it mean